18psi on a scooby and the engine will laugh at u, i ran a stealth back exhaust no cats w a Genome Axle back at 20 psi.
DP 4"
test-pipe / mid-pipe 3"
my muffler was 2.5"
that set up creates just the right amount of back pressure and ur car will be a beast (spool up) yet tame when u need to be...
if u go 3" all the way back ur turbo will spool slower
thats y i did it this set up, i had ABSOLUTLY NO turbo lag...
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