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Sounds like a good build! However, if you could use the room, 5" DP is wayyyy over kill. 4" is plenty.

EDIT: I read your link to get the info I was questioning...




I disagree, I logged back pressure and seen a near 1:1 ratio with my s475/5inch down pipe.... It's all about pressure differential....



This is basically what I was told,

All else being equal, _The amount of work that can be done across an exhaust turbine is determined by the pressure differential at the inlet and outlet_ (in English, raise the turbo inlet pressure, lower the outlet pressure, or both, and you make more power) Pressure is heat, heat is pressure.

Raising the inlet pressure is possible, but tough. Lowering the outlet pressure is easy - just bolt on a bigger, free flowing exhaust. I've seen a couple of posts from people who added aftermarket exhausts, who report "my turbo spools up faster now" Well, that's because by lowering the outlet pressure, you increased the pressure differential, and now the exhaust gas can expand more, and do more work. That increased work pushes harder on your turbo, and it spools up faster. You should also see less boost drop at redline, because if an exhaust system is flow-limited, once you pass the flow limit of the system, any additional gasses you try and force through it only raise the outlet pressure. Higher outlet pressure, lower pressure differential, less work, less boost.

[Note that the compressor side comes into play here too - that's another story]

SRT8 CHARGER "Four door bore" <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />