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I did a bursch cat bypass and one in one out exhaust on my 87 911 3.2. I also did the Steve Wong chip this week. Wow, what a difference.....it pulls so much harder in the lower RPM range and the idle is smooth as glass. I had to adjust my idle down 200 RPMs after the chip and I made sure to disconnect the brown wire for emissions ( I guess I have a California spec 911?) I still need to check and make sure I'm getting 100% throttle open when pedal is pressed, but I did a minor adjustment already. Money well spent! I got the 91 octane chip for my setup in case I go out west with it.
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