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      09-26-2011, 11:22 AM   #22
drstorm
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Canada
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Drives: 1m
Join Date: Jun 2009
Location: America

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have ams, synapse bov in mine and jb4. Make more power but not a lot more to my impression. DIfference is really bigger when 135i stock to jb3 then m1 stock to jb4. BUt car run smooth. I think the biggest difference is that you have always overboost. Keep in mind that on a 350hp car butt dyno is not accurate!