Need Help with correct Downpipe Size

[HALF DUZZIN]

Im running a 3" DP and I have the KB 4 bolt headers with a VBand PTE 68/70, champion alum. Heads and Intake....218/218 Lunati Cam... Fully balanced and blueprinted, with a 3800 stall. Do I need a bigger DP?

 

[The Granny]

I've got a 3" on a similar set up, minus the aluminum heads. I don't think it's a restriction, but going bigger definitely won't hurt anything. It'll help reduce back pressure for sure. But with 4 bolt headers and a vband exhaust side on the turbo backpressure should already be minimized. I'm not educated enough on that subject to say whether or not a bigger downpipe would reduce back pressure enough to make a difference


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[Boost231]

No

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