Exhaust System Advice Please
Thread Starter
Pro
Joined: Dec 2017
Posts: 594
Likes: 55
From: Plymouth Minnesota
Exhaust System Advice Please
I am looking for exhaust system advice from experienced forum members
My car is a 2010 Grand Sport Convertible with LS3 engine, A6 automatic transmission and 2.73 axle ratio. Presently the car is stock including the NPP exhaust option.
My goal is primarily to increase both torque and horsepower (vs all out high rpm horsepower). I want to keep it naturally aspirated and stay with the existing cam and NPP. Bolt ons purchased so far are: 1/ Vitesse throttle controller 2/ Vararam cold air intake 3/ Rod Mod LS3 intake manifold 4/ existing stock NPP muffler/exhaust system.
I am looking for primary exhaust system recommendations. A/ existing stock LS3 exhaust manifolds with single pair of cats and 2 1/2” X-pipe. B/ Jet Hot coated Hooker shorty headers with stock pair of cats and stock 2 1/2” X-pipe. C/ Z06 exhaust manifolds with Z06 cats and Z06 3” H-pipe. D/ OBX 1 7/8” S.S. headers with OBX S.S. high flow cats and OBX S.S. 2 1/2” X-pipe.
Please rank the above exhaust options and why you rank them in that order.
My car is a 2010 Grand Sport Convertible with LS3 engine, A6 automatic transmission and 2.73 axle ratio. Presently the car is stock including the NPP exhaust option.
My goal is primarily to increase both torque and horsepower (vs all out high rpm horsepower). I want to keep it naturally aspirated and stay with the existing cam and NPP. Bolt ons purchased so far are: 1/ Vitesse throttle controller 2/ Vararam cold air intake 3/ Rod Mod LS3 intake manifold 4/ existing stock NPP muffler/exhaust system.
I am looking for primary exhaust system recommendations. A/ existing stock LS3 exhaust manifolds with single pair of cats and 2 1/2” X-pipe. B/ Jet Hot coated Hooker shorty headers with stock pair of cats and stock 2 1/2” X-pipe. C/ Z06 exhaust manifolds with Z06 cats and Z06 3” H-pipe. D/ OBX 1 7/8” S.S. headers with OBX S.S. high flow cats and OBX S.S. 2 1/2” X-pipe.
Please rank the above exhaust options and why you rank them in that order.
Team Owner
Joined: Dec 2012
Posts: 30,427
Likes: 1,609
From: Outside the Quick Stop N.J.
True headers are the way to go, but IMHO the best "bang for your buck" is a Z06 setup. I did a complete manifolds to mufflers swap on my 13 GS which eliminated the secondary cats. Just FYI, if you do go that route the 3" mufflers/pipes can be difficult to fit in an automatic car.
