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Old 11-14-2018, 01:57 AM   #9
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From what I understand a Z3 chassis would be the easiest way. There is some decent resale value on Z3 parts as they are not plentiful in the aftermarket world. Yes the computer so to speak has been cracked for a while and there are multiple tuning options.

I would recommend overhauling any motor you for a peace of mind but leaving the bottom end together if you'd like. That way you can ensure a leak free future. I'd throw some headers on as well for a slight HP bump and sound. Looks like complete wrecked Z3s can be found. You could even toss in a set of cams for bump/aggressive power band.
98 318Ti S52
84 318i M10 Zender
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