Just installed it on my 520i today, took about 15 mins, very easy to install. Initial impression it pulls stronger from 2k rpm onwards. Definitely noticed the difference. Given I've also test drove the 528i before, I find stock 528i is still a touch faster. No complaint for the price tag. Hopefully Terry can get his hand on a 20i so that it can be tuned even further given the higher compression ratio.
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2012 F10 520i
2005 E90 330i
2001 E46 328ci
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