Low, almost no backpressure
#11
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I still don't get the whole "backpressure" argument. You want the lowest backpressure possible. If you have greater resistance to flow, that means more of the energy your engine makes goes towards pushing the exhaust out instead of spinning the crank. The problem that causes the power loss IMO is that the the diameter of the pipe is too big and exhaust velocity goes down significantly. The dynatech headers with their "small" 2.5" collectors and 2.5" Y pipe did GREAT on my 6.0 if that tells you anything.
#12
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the truck wasn't tuned till all the bolt ons were done, lt headers, ory, 3'' single in 3'' dual out magnaflow, underdrive pulley, low temp stat, shift kit with servos and tuned by Xessive. The truck has a 5.3 with 3:73 gears. I attended the tuning school cause I thought there might be a problem with the tune, but the tune is perfect. GMCtrk what do you reccomend me to do with my current exhaust setup? I was thinking about stepping my piping down to 2.5 right after the pacesetter y-pipe and into a single in 2.5, and single out 2.5 magnaflow, and take it all the way back under my bumper.
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the truck wasn't tuned till all the bolt ons were done, lt headers, ory, 3'' single in 3'' dual out magnaflow, underdrive pulley, low temp stat, shift kit with servos and tuned by Xessive. The truck has a 5.3 with 3:73 gears. I attended the tuning school cause I thought there might be a problem with the tune, but the tune is perfect. GMCtrk what do you reccomend me to do with my current exhaust setup? I was thinking about stepping my piping down to 2.5 right after the pacesetter y-pipe and into a single in 2.5, and single out 2.5 magnaflow, and take it all the way back under my bumper.
#19
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Whatever you do do not step your exhaust DOWN from the 3" output of the Y-pipe to 2.5". That will create a restriction that the engine will not like. Exhaust methodology is to never "step down" as you route away from the engine, though you can always "step up" as an anti-reversion technique.
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So what do you think about this idea GMCtrk?