Exhaust?

[KenP]

Originally Posted by tomp

I'd say that the MAF is restricting you more than the CAT is. Go with the Granatelli MAF: 350120-C

http://www.granatellimotorsports.com/gmmaftruck.htm

Good thought, but I've never heard of an independent dyno offering positive, increased HP, on those.

Originally Posted by tomp

I think you'd be better off getting custom mapping done on your ECM. If you don't have it already, it's probably running too lean with what you have there.

There's a homerun!!! Contact Dragon or TAZ through their website:
http://hummercustoms.com/default_hc.asp

They can hook you up with a Nelson program just for your truck.

[SUT NEIL]

I've been very pleased with all ranges of performance and sound with the following mods:
Volant Cold Air Intake
Granatelli MAF Sensor
Bassani SS Catback dual exhaust (With exhaust tips tucked up
close to frame)
Superchip Programmer (In Tow Mode Setting Option)

Hope this helps!

[HUM GOOD]

Originally Posted by SUT NEIL

I've been very pleased with all ranges of performance and sound with the following mods:
Volant Cold Air Intake
Granatelli MAF Sensor
Bassani SS Catback dual exhaust (With exhaust tips tucked up
close to frame)
Superchip Programmer (In Tow Mode Setting Option)

Hope this helps!

I'm pretty damn close to your set up.

K&N cold air intake
Borla catback dual exhaust with borla headers
Granatelli Diablo super tuner

and I just ordered the Granatelli MAF Sensor

Thanks for your input

[tomp]

Also, I have never really looked into it, but that flattened exhaust pipe just below the tranny may be impeding exhaust flow. It is done this way to decrease the likelyhood of rattling from the movement of the engine/exhaust system. Any muffler shop would be able to tell you if it does. The canl fix it and install a welded on attachment with rubber grommet to reduce noise.