Quote:
Originally Posted by reddozen
Simple answer is none. the most that I've seen documented is 5HP, but that can be argued as just a tighter motor/better tune. I would stick to stock, AEM, Mazda Speed (repackaged AEM), or Racing Beat. They're the only things proven to not loose HP.
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those are the brands i noticed in forums, not discontinued or ones that are common people pick up.. well thank you for your time and ill go from there.