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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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My Cars:
1974 RX4 Coupe
1991 FC3S RX7 - Sold
2003 ZZW30 MR2 (Rotary swap after RX8)
2004 SE3P RX8 (20B Swap in the works)
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