I think its a good move to go to FI. Because really to get any real performance gains out of an M motor is to go FI anyway. I had an e46 M3 and you could put every possible bolt on they ever created with software and you may net maybe 30 more hp. FI is the only way your gonna have a fast car with decent mpg.
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Mods list got too long, lets just say more than enough .
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