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10-19-2005, 07:31 PM
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Hummer Authority
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Join Date: Sep 2005
Location: Texas
Posts: 1,795
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Everytime I have installed a performance exhaust systems on my vehicles, I lose performance - mainly low end torque, throttle response and drivability. No one drives around at 5,000 RPM, and this is where the performance is noticed most.
I need an exhaust system that will increase performance without losing my low end torque. The engine in the Hummer is desgned to provide maximum torque at low RPMs to get this heavy vehicle moving.
I have tried differnt brands on every vehicle that I have had and they all do the same thing. I am fed up.
I odered the Corsa Touring series thinking this will add some additional back pressure over this current Gibson exhaust system.
I regret ever removing my stock exhaust as this thing is very sluggish down in the low RPM ranges since I removed the stock exhaust.
Any ideas guys? I am so tired of this marketing crap. All of their dyno charts so gains about 3200 RPM+, but we normally drive much lower than this.
__________________
H2 SUT 4.56 Gears, Front Locker, Cognito Pitman/Idler kit & Idler Pivot Kit, Fab Tech Tie Rods, True Tech Trailing Arms, Edelbrock Panhard Rod, PML rear Diff & Tranny Pans, Corsa Exhaust, Dynatech LT Headers, Diablo Predator Programmer, Volant CAI, Warn 9500 Winch, Escort 8500x50 & ZR3 Laser Shifter, Delta Light Bar, Rancho Steering Stabilizer & Bilstein Shocks, Ron Davis Radiator, PowerSlot Rotors, Hawk Brake Pads
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10-20-2005, 02:15 PM
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Hummer Deity
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Join Date: Feb 2005
Location: In the basement of the Alamo
Posts: 10,855
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Dan:
That's why I didn't do it. If I had a lift I definitely would have. Laying on my back and having hot slag dropping on me doesn't sound appealing. 
</div></BLOCKQUOTE>
Damnit!   |
10-19-2005, 08:35 PM
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Hummer Guru
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Join Date: Nov 2002
Location: Cognito
Posts: 2,155
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XtremeFlow Thunder Chamber! 
http://www.h2performanceparts.com/about_us.htm
and more detailed info at:
http://www.h2fanatic.com/forum/archi....php/t-98.html
Not sure if it does develop the HP figures they advertise, but I can tell you there definitely is an increase. My SUT used to downshift on a certain highway hill every day on my commute. If it didnt downshift it would slowly drop speed. Now it never downshifts and keeps a constant or slightly increasing speed. |
10-19-2005, 07:45 PM
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Hummer Authority
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Join Date: Sep 2005
Location: Texas
Posts: 1,795
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Can you offer some suggestions as to where to look when looking at exhausts?
__________________
H2 SUT 4.56 Gears, Front Locker, Cognito Pitman/Idler kit & Idler Pivot Kit, Fab Tech Tie Rods, True Tech Trailing Arms, Edelbrock Panhard Rod, PML rear Diff & Tranny Pans, Corsa Exhaust, Dynatech LT Headers, Diablo Predator Programmer, Volant CAI, Warn 9500 Winch, Escort 8500x50 & ZR3 Laser Shifter, Delta Light Bar, Rancho Steering Stabilizer & Bilstein Shocks, Ron Davis Radiator, PowerSlot Rotors, Hawk Brake Pads
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10-20-2005, 01:33 PM
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Hummer Guru
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Join Date: Nov 2002
Location: Cognito
Posts: 2,155
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Screeper:
Remember an exhaust system is almost a quarter of the way to a supercharger. That will be the way I go if I get the performance bug again. Good luck  </div></BLOCKQUOTE>
You'd pay $1500 for an exhaust? 
What did they say it was clogged with? Packing? Catalytic beads? As far as I know XF doesn't use packing in their systems. Sounds very strange..... |
10-19-2005, 10:46 PM
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Hummer Guru
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Join Date: Oct 2005
Location: Charlotte, NC
Posts: 2,767
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by tomp:
Everytime I have installed a performance exhaust systems on my vehicles, I lose performance - mainly low end torque, throttle response and drivability. No one drives around at 5,000 RPM, and this is where the performance is noticed most.
I need an exhaust system that will increase performance without losing my low end torque. The engine in the Hummer is desgned to provide maximum torque at low RPMs to get this heavy vehicle moving.
I have tried differnt brands on every vehicle that I have had and they all do the same thing. I am fed up.
I odered the Corsa Touring series thinking this will add some additional back pressure over this current Gibson exhaust system.
I regret ever removing my stock exhaust as this thing is very sluggish down in the low RPM ranges since I removed the stock exhaust.
Any ideas guys? I am so tired of this marketing crap. All of their dyno charts so gains about 3200 RPM+, but we normally drive much lower than this. </div></BLOCKQUOTE>
That is why I am only replacing mufflers this time... not entire systems/catbacks.
Usually I install anything from long tubes to cat backs... I don't want to lose any low end so a muffler is what is going on this time.
Mark
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10-22-2005, 11:15 AM
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Hummer Guru
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Join Date: Nov 2002
Location: Cognito
Posts: 2,155
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Here's the inlet of the Thunder Chamber.
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10-20-2005, 08:05 PM
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Hummer Veteran
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Join Date: May 2004
Location: Lighthouse Point Florida
Posts: 175
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I think the dealership wanted 1500 installed for the Corsa when I got my truck. That was in June of 04 though when the corsa was newer. Dealership prices suck. Thats why I tried the extreme flow. I think I paid around 700 dollars for the "performance package" claimed like 45 hp and two more mpg. Sounded good at the time.
__________________
2004 Lux with 6 inch Fabtech with tie rods, 38 inch MT's, 4:88 gears, and some minor engine tweaks.
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10-20-2005, 02:00 PM
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Join Date: Feb 2005
Location: Vegas
Posts: 1,571
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Dan:
Hey, I have a welder!  </div></BLOCKQUOTE>
I don't.
Been thinking about buying one and learning how but I can think of a dozen or so other places to practice besides the underside of the SUT. Boom.
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\'05 SUT
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10-19-2005, 07:43 PM
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Hummer Messiah
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Join Date: Apr 2003
Location: Virginia Beach
Posts: 37,474
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Always look at low end torque for these big rigs.
__________________
"My reading of history convinces me that most bad government results from too much government."---Thomas Jefferson
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10-19-2005, 07:31 PM
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Hummer Authority
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Join Date: Sep 2005
Location: Texas
Posts: 1,795
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Everytime I have installed a performance exhaust systems on my vehicles, I lose performance - mainly low end torque, throttle response and drivability. No one drives around at 5,000 RPM, and this is where the performance is noticed most.
I need an exhaust system that will increase performance without losing my low end torque. The engine in the Hummer is desgned to provide maximum torque at low RPMs to get this heavy vehicle moving.
I have tried differnt brands on every vehicle that I have had and they all do the same thing. I am fed up.
I odered the Corsa Touring series thinking this will add some additional back pressure over this current Gibson exhaust system.
I regret ever removing my stock exhaust as this thing is very sluggish down in the low RPM ranges since I removed the stock exhaust.
Any ideas guys? I am so tired of this marketing crap. All of their dyno charts so gains about 3200 RPM+, but we normally drive much lower than this.
__________________
H2 SUT 4.56 Gears, Front Locker, Cognito Pitman/Idler kit & Idler Pivot Kit, Fab Tech Tie Rods, True Tech Trailing Arms, Edelbrock Panhard Rod, PML rear Diff & Tranny Pans, Corsa Exhaust, Dynatech LT Headers, Diablo Predator Programmer, Volant CAI, Warn 9500 Winch, Escort 8500x50 & ZR3 Laser Shifter, Delta Light Bar, Rancho Steering Stabilizer & Bilstein Shocks, Ron Davis Radiator, PowerSlot Rotors, Hawk Brake Pads
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10-19-2005, 10:23 PM
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Join Date: Nov 2003
Location: HIHUMMER =\'s Mrs. Churchie :D
Posts: 1,585
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FLOWMASTER
That Is All
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10-19-2005, 09:19 PM
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Join Date: Feb 2005
Location: Vegas
Posts: 1,571
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tomp answered my question.
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\'05 SUT
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10-20-2005, 01:14 PM
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Hummer Veteran
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Join Date: May 2004
Location: Lighthouse Point Florida
Posts: 175
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Do what I did. I had the extreme flow (May have been a bad one) and my performance dropped to zero. It then progressivly got worse and worse until it was scary to drive. Third trip to dealership they found temperature in front of exhaust muffler was off the scale(blockage). It was burning up the sensor. Dealership was nice enough to let me have an old factory setup that they had laying around from anouther exhaust swap out. Never drove better. Remember an exhaust system is almost a quarter of the way to a supercharger. That will be the way I go if I get the performance bug again. Good luck
__________________
2004 Lux with 6 inch Fabtech with tie rods, 38 inch MT's, 4:88 gears, and some minor engine tweaks.
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10-19-2005, 09:02 PM
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Join Date: Feb 2005
Location: Vegas
Posts: 1,571
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Dan:
XtremeFlow Thunder Chamber!
</div></BLOCKQUOTE>
Did you do the install?
__________________
\'05 SUT
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10-20-2005, 12:41 AM
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Hummer Authority
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Join Date: Apr 2003
Location: Las Vegas
Posts: 1,819
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I have the XtremeFlow also! Luv it!
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... Teh black won't get you back
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10-21-2005, 09:56 PM
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Hummer Veteran
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Join Date: May 2004
Location: Lighthouse Point Florida
Posts: 175
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Very possible. In their defense I never pursued a warranty issue. Once the truck ran well again I just let it go.
__________________
2004 Lux with 6 inch Fabtech with tie rods, 38 inch MT's, 4:88 gears, and some minor engine tweaks.
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10-22-2005, 12:33 AM
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Hummer Authority
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Join Date: Nov 2004
Location: Little Rock, Arkansas
Posts: 1,784
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I do not know if it is a regional thing or what. I run a Dynatech stainless header and catback system with true duals all the way out over rear axle. I used super 40 flowmaster mufflers all stainless front to back on the whole system. I saw instant perf. gains. I recommended it to some more and some of them werenot H2 but they all recieved the same improvement. Dynatech is a smaller company and get's overlooked alllot. But, i think guy should give it more of a look and try it. If You look for a performance exhaust shop and not a muffler shop You will receive a different attitude as to why they are doing there job. They are looing to make you run better and sound good. muffler shop is working to quiet you down and do not think thay have anything to do with perf. and that is what you get out of the 2 different cases with exceptions of course.
Try Dynatech. i will never run anything else as long as they do not do something screwy. I love them and it sound perfect. Light till You get on it and then you wil hear it. Freeway nice light tone never bothers anyone that rides. In fact get many good comments about sound on freeway. Now I do not what it will sound like since i had the system sterling coated inside and out by Jet Coat. I hope it does not change sound b ut, it will drop temp. dramatically they told me. Will not melt stuff with headers with treatment.
The Dynatech stainless all the way out was $1450 installed about a year ago.
TAZ
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05 H2 SUV cus. paint, Magnuson SC 6/12lb boost, cowl hood scoop, 12" dash touchscreen, GM elec. fans, HPTuners.com tuning soft., Dynatech headers dual catback exhaust Jet Hot chrome front to back Flowmaster Super 40's, Diamo 8 Karat rims & 325X60-20" Toyo, 4 OEM Captain seats Katzkins leather, rear console computer inside running all AV/NAV etc., Infinity component system 3 amps Tsunami Caps, rear flip down 12" monitor, headrest monitors, overhead console boost, fuel pressure, & A/F ratio gauges
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10-19-2005, 07:48 PM
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Hummer Messiah
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Join Date: Apr 2003
Location: Virginia Beach
Posts: 37,474
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by tomp:
Can you offer some suggestions as to where to look when looking at exhausts? </div></BLOCKQUOTE>I have the B&B and love it. I'm sure some other's will post better suggestions.
__________________
"My reading of history convinces me that most bad government results from too much government."---Thomas Jefferson
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10-20-2005, 10:06 AM
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Hummer Guru
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Join Date: Nov 2002
Location: Cognito
Posts: 2,155
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by rodster:
tomp answered my question. </div></BLOCKQUOTE>
Hey, I have a welder!
I actually had a hard time finding someone to install it. No one wanted to touch a Hummer. After about 12 places I found a Midas in a neighboring town to do it. The guy did a nice job. Took his time and made sure all the welds were nice. $130 & took him about 90 minutes. |
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Fed up with these so called performance exhaust systems!
