If I had to guess I'll say an improvement of 5-8 hp. I have a baseline dyno run for my car done by Jake Raby. I'm going to get another run done by Jake now that I have done the headers/high flow cats, cat delete and Dansk muffler to see what they really added. Then plan on doing a UD pulley install by Jake and do one more run to see what that added. If nothing else good data points.
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2002 Boxster S Arctic Silver with black top with glass window and black leather interior. Jake Raby 3.6 SS ( the beast ) with IMS Solution. 996 GT3 front bumper , GT3 rocker covers and GT3TEK rear diffuser and Joe Toth composites rear ducktail spoiler .
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