One single 3" pipe will do just fine on the 4.8. Exhaust velocity is important, it helps to scavenge the spent gases out of the cylinders.
One single 3" pipe will do just fine on the 4.8. Exhaust velocity is important, it helps to scavenge the spent gases out of the cylinders.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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