Quote:
Originally Posted by MixtapeMessiah
in an exhaust system u need a certain amount of backpressure. No back pressure is a bad thing. As for having 2.5 inch pipes ur gonna lose bottom end power, shoulda stuck with the 2.25'' inless ur running a boosted application
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No that's wrong and it's an old hot rodders myth. You don't want any backpressure at all....none. No backpressure is the best thing. Like I stated before, 2.25" pipes will maintain exhaust velocity and low end torque on a 2.2 or 2.4L 4 cylinder engine. Why would you use the same size for a larger displacement engine with 2 more cylinders and much more exhaust flow? The best exhaust for the 3400 V6 would be made with at least 2.5" piping and straight through mufflers. The baffled mufflers may sound nice, but they don't flow as well as the staight through mufflers. Instead of relying on the butt dyno to tell you if you gain or lose low end torque, get the car dyno'd and you'll see for sure.
If you just want a nice sounding exhaust and don't care about performance, get a baffled muffler on whatever size piping you want, but then don't come back complaining that you lost power/torque.