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04-03-2004, 03:13 PM
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Hummer Expert
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Join Date: Feb 2004
Location: 8 Miles High
Posts: 725
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Anyone have any info on this?
http://www.secureperformanceorder.co...mer_truck.html
All stainless steel, long tube header system, for 2003-04 Hummer H2s. Direct bolt-on fit, includes dual high-flow cats, fully OBD-II compatible retaining all emission connections. Increased horsepower and torque, over 10%, and 15% improved fuel m *Additional Product Information* Company: Dynatech Competition Exhaust Address: P.O. Box 608 Boonville IN 47601 Phone: 812/897-3600 Fax: 812/897-6264 Website: email: bfloyd@dynatechheaders.com
SOURCE -- Wieck Media Services / Auto
__________________
Now that I am officially retired,
I don wanna work, just wanna bang on the drum all day!
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04-03-2004, 03:13 PM
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Hummer Expert
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Join Date: Feb 2004
Location: 8 Miles High
Posts: 725
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Anyone have any info on this?
http://www.secureperformanceorder.co...mer_truck.html
All stainless steel, long tube header system, for 2003-04 Hummer H2s. Direct bolt-on fit, includes dual high-flow cats, fully OBD-II compatible retaining all emission connections. Increased horsepower and torque, over 10%, and 15% improved fuel m *Additional Product Information* Company: Dynatech Competition Exhaust Address: P.O. Box 608 Boonville IN 47601 Phone: 812/897-3600 Fax: 812/897-6264 Website: email: bfloyd@dynatechheaders.com
SOURCE -- Wieck Media Services / Auto
__________________
Now that I am officially retired,
I don wanna work, just wanna bang on the drum all day!
|
04-03-2004, 03:13 PM
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Hummer Expert
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Join Date: Feb 2004
Location: 8 Miles High
Posts: 725
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Anyone have any info on this?
http://www.secureperformanceorder.co...mer_truck.html
All stainless steel, long tube header system, for 2003-04 Hummer H2s. Direct bolt-on fit, includes dual high-flow cats, fully OBD-II compatible retaining all emission connections. Increased horsepower and torque, over 10%, and 15% improved fuel m *Additional Product Information* Company: Dynatech Competition Exhaust Address: P.O. Box 608 Boonville IN 47601 Phone: 812/897-3600 Fax: 812/897-6264 Website: email: bfloyd@dynatechheaders.com
SOURCE -- Wieck Media Services / Auto
__________________
Now that I am officially retired,
I don wanna work, just wanna bang on the drum all day!
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04-04-2004, 03:09 AM
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Hummer Messiah
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Join Date: Apr 2003
Location: Virginia Beach
Posts: 37,474
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I have discussed this with another member recently. He just installed a set of "high flow" cats and loves the sound. He also says the truck performs better.
I am still investigating. A question has arisen. Maybe someone out here knows more. Stock cats are OBD and 400 cells per sq in. Aftermarket performance cats are the same. I was told, point blank by a muffler shop and performance shop, that H2's have "high-flow cats" as a stock item. And new ones would do no good unless there was a problem with the stock items.
Any assistance in this matter would be appreciated.
__________________
"My reading of history convinces me that most bad government results from too much government."---Thomas Jefferson
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04-04-2004, 07:13 AM
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Hummer Veteran
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Join Date: Dec 2003
Location: Newnan, GA (transplanted Texan)
Posts: 82
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KenP,
I don't know about the stock cats but XtremeFlow offers weld on high flow cats on their website. Last time I looked they were $269 for the pair. Obviously, they claim the requisite HP and MPG increase but I don't have any experience with them so... caveat emptor!
__________________
Yellow 03 Adventure w/black Grill, UM8 Touch Screen Navigation Radio, U2K XM Digital Radio, Remote 6-CD Changer, JBA Titanium Headers, Corsa Off-Road Sport, Airaid Filter & MIT, Nology Wires & Plugs, S&P Pro-Flash, Warn 9.5ti w/X-Line, Toyo Open Country M/T 37x13.5.
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04-04-2004, 11:58 AM
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Hummer Expert
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Join Date: Feb 2004
Location: 8 Miles High
Posts: 725
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I am looking to replace the headers also and looking for input. These are the first FULL length headers I have come across, all others are shorties. Cats are an option and it appears no welding is required.
__________________
Now that I am officially retired,
I don wanna work, just wanna bang on the drum all day!
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04-04-2004, 01:48 PM
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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 SS XtremeFlow cat back and love the sound and increased perf however XtremeFlow claims better MPG and I haven't noticed any MPG increase what so ever.
__________________
... Teh black won't get you back
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