Quote:
Originally Posted by terminaltsi
any engine with a turbo wil lperform best with the largest possible, or no exhaust. the turbo itself provides tons of backrpessure; after the turbo, you want the largest size piping you can fit/afford based on your HP goals.
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completly. you want the exhaust to be as free as possible after the turbo, but that brings up another topic of discussion, the outlet in the turbo is 2.75", so when does making the exhaust bigger have no increase on flow. itd be nice to measure the pressure in a 3, 4, and 5" exhaust at WOT.
as far as the 4" down pipe into 5" muffler back, its pointless for performance, if you were going to make a step in sizes you'd want the 5" down pipe into 4" muffler back, as the exhaust gets further from the engine it gets cooler, more dense, basically smaller, so you dont need the larger exhaust toward the end.
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'01 - 2500, 47re 2wd, 53 Block 70k miles and counting.... no cracks
4" turbo-back - Intake w/ heat shield - Traction bars - AirDog 150 - Edge Juice with Attitude
HOT - HX-40 limited to 36psi - Getting Close to Leveled, rear dropped 2" - 7x.010" Injectors - 285/60-18's on Black Rims w/ Machined Lip - Tailgate Spoiler - Black Projector Headlights - 7" White Miter Cut Stack
14.2 @ 100 6psi boosted lanuch(hx-40 making 35psi, pre-injectors)
Last edited by Rollin Coal : 05-11-2008 at 09:24 AM.