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For me, my FRS with catless header and tune (running east coast 93 octane or 100 on the track for extra safety margin) was about perfect. Reliable, sounded great, was near even with stock s2000's on the straights.
Now that I've moved to socal, I'm back to stock header and tune on 91 octane. It's noticeably slower. I'm going to try e85 to see if that is enough.
Was trying to stay NA for reliability, but if e85 doesnt cut it, I'll probably look into an Edelbrock SC.
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