Why did you install test pipes with the Stillen Supercharger? Stillen says you will drop 20 WHP with them so you could have kept your cats and used the 8lb pulley and probably got the same WHP. I know mustang dynos don't read the same as a dynojet but your numbers look low to me considering you did the 9lb pulley. My car was on the dyno yesterday and did 418whp on the 8lb pulley and stock cats.
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