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Originally Posted by 2K3_Boxster_S
hmm. yes I see what you are saying. your dyno sheet drops at almost the same exact point. not nearly as drastically though 10Lbs i think. I'm also looking at a difference in the Rpms and Mph, don't think that matters though. If its a plug or MAF you can not tell by driving the car. Plus shouldn't you get a CEL if it was the MAF?
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There are lots of issues that can reduce output without throwing a CEL.. some of these are MAF issues, others are fuel pressure or fuel injector related and even issues with catalytic converters.
Or a low power engine may have an impending mechanical issue... I haven't ever seen a healthy Boxster S engine that didn't make at minimum 205HP at the wheels.. That engine was very tired with near 30,000 track miles on it.