I have searched this out for hours and not really got the answer I was looking for, I have always thought that doing a stage 3 all at once was the way to go, but I was wondering how much of a difference will you notice with an ecu upgrade (ASH or JWT w/boost jets) with stock exhaust compared to a cat-back? Can the stock exhaust even handle the aftermarket ECU's added boost?
Follow Ups
ECU comparison with stock exhaust & aftermarket... - TPZ9309:53:45 05/18/05