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Originally Posted by 2K3_Boxster_S
Re-think, what you just said. As soon as the car is re-flashed back to stock file the car runs fine. Those nasty NHP headers help make an overall bolt on HP gain of 18 HP. That comment makes no sense whatsoever.
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I know a few people who have had issues with those headers and cats. Namely, ongoing problems with CELS, and in some instances a loss of back pressure as compared to the oem set-up. Nevertheless, was FVD made aware of the fact that you are using those headers and cats ? And, were they sure to have written the software to accommodate these changes in equipment. Especially given the fact that you are now using 200 cell cats.