M3 Rematch...
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The Best V8 Stories One Small Block at Time
40Hp are some good gains though.
At least that was the case with my piggyback on my truck when I had the turbo.
I was at an F8x dyno day and with a JB4 (which I believe is around $600-800 not bad at all) and E85 these cars can hit just around 500whp with a baseline of 412-420whp
On the same dyno same day my old LS3 C6 put down 395whp, a bolt-on e90 M3 put down 360whp





