8.1 litre performance exhaust

[NWDmax]

Who makes a dyno proven performance exhaust for the 8.1 litre engine?
My cuz has an 01 suburban and wants a proven power adding cat back system.
Please hurry the dough is burning a hole in his pocket.
Thx in advance!
Blake

[8.1GASSER]

I've had many in the past(not all for the 8.1) Had Borla(never again), Gibson, Dynomax, etc. This time I spent my green on Flowmaster and have not regretted it yet. If you do some searching around other forums you'll find that Flowmaster or Magnaflow seem to be the ones to beat. Have your cuz couple that cat-back with some headers from The Other Guys out in CA for some good gains.

[mark45678]

guys/ gals FYI these trucks can make ALOT of noise , do your home work on the muffler before you by them! My buddys truck with a 2.5"cat back is LOUD when its pulling a load!