Quote:
Originally Posted by Jferg2223
the norm piping should be 2.25 because the car requires atleast 2 pounds of backpressure to maintain torque specs. stay with stock size pipe you can run slightly larger muffler.
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No backpressure is the best. You don't want any backpressure at all, you want to maintain exhaust velocity to keep your low end torque. And 2.5" should be the norm for a 3.4L V6....in this case the N-body's 3400. 2.25" exhaust piping works well for the 2.2L Ecotec and 2.4L LD9 4 cylinder engines. It's even been dyno proven that 2.5" piping can also maintain low end torque for these 4 cylinder's, but everyone still likes 2.25". For a big V6 like the 3400, at least 2.5" is the way to go.
As for the mufflers, you'd be better of going with a straight through muffler like Magnaflow instead of a baffled design like the Flowmasters. No backpressure means the least amount of restriction possible, and with a baffled muffler, you have baffles blocking exhaust flow to quiet the tone. Yes, they will flow better than stock, but straight through mufflers flow better than baffled mufflers.
And if anyone else has ever seen the inside of the stock resonator, you'll know what I mean when I say it's very restrictive. Dump it when you can and if you think it's too loud, add a different one, also straight through like the muffler.