My 2 cents
I have a 2000 S w/30K miles- I have the upsolute chip, FVD headers and short shift, Dansk 100 cell cats and muffler. I also added a cold air cone. HP increase? I don't really know, but I do know that these mods have not caused a single problem. Anyone concerned about these sorts of changes should take solace in the fact that I am thoroughly pleased with the changes. Great sound, wonderful performance, and zero problems! I say go for it!
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