I've upgraded to champion ported iron heads and intake with 6466 turbo which appears to be flowing much more than the internal wastegate can manage. Since I'm now in need of an external wastegate setup I'm curious about the downpipe and wastegate sizes that I should consider. I see 3 inch DP is most common, but 3.5 inch is also available both with 46mm valve size.
What are the pro's and con's of 3 inch versus 3.5 inch?
any gain moving from a THDP (3") to a TA Performance 3.5" External Gate down pipe??
250 CU Stroker Motor
GN-1 Heads
E85
TA SS/Race Headers & 46MM Gate
6870 3 Bolt DBB Turbo
Pypes 2-1/2 inch exhaust --soon to be replaced with ATR 3" SS Crossflow
