Dynatech Header System

[OldHiker]

Anyone have any info on this?

http://www.secureperformanceorder.com/dynatechstore/hummer_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

[OldHiker]

Anyone have any info on this?

http://www.secureperformanceorder.com/dynatechstore/hummer_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

[OldHiker]

Anyone have any info on this?

http://www.secureperformanceorder.com/dynatechstore/hummer_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

[KenP]

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.

[Bevo]

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!

[OldHiker]

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.

[NJ H2]

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.