I have no cat in my s4 and I see positive pressure starting at about 2500 and full boost before 4000. Stock ports, stock wastegate.
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'87 TII- full emissions removal, a/c removed, FPD removed, dual 12" e-fans, Rotary Performance FCD, ACT unsprung 6 puck w/ Xtreme PP, custom open 2.5 inch exhaust, custom clutch pivot ball, K&N cone filter, TB mod, RB downpipe, motor blown 8/7/09
'94 Mazda B4000- POS beater truck, stock
"The easiest way to fail is to never try." - Me
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