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I'd install a FMIC (ER and VRSF are both good) next and have the car ProTuned by PTF. The bump in power from stage 1 to stage 1+ FMIC is big....then ProTune usually adds another 30-40 whp/wtq and better overall drivability.
To give you an estimate, I'm stage 1+ ProTuned by Bren Tuning (I think he does e-tuning also) and made 386whp and 430wtq on the dyno. My OTS stage 1+ was 340whp and 400wtq.
I have stock DP, N55 mids with Vibrant Resonators welded in, and the Meisterschaft Race axle back. It sounds great...louder than stock with a beautiful exhaust note. I added the resonators because the N55 mids induced some rasp that I was trying to eliminate.
Enjoy, and Happy Modding!!!
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