Isn't this for F-street class autox? (thought I saw a post of yours in the massive F-stock/street catch-all thread)
If so, if you go with an E90 other than a 2011 with ZCP, then you're stuck with 1/2" narrower wheels all around (8.5, 9.5). Not a total deal killer, but just having to give up a 1/2" is worth (?) on a Nationals caliber long course.
Richbot may still have the TRMotorsport 8.5/9.5 wheels I sold him a few years ago. I autocrossed my E90 in F-street back in 2013 before the +/- 1" diameter rule, and used 275/35 square on those wheels with excellent results. At the time in 2012 during my 2011 E90 6MT slicktop hunt, I specifically ignored ZCP cars since the top street class legal tires weren't available in 19" sizes, so the ZCP package was a serious handicap.
If you're going to STU, then I'd agree with looking at an older car since the street class restrictions are gone.
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Current Stable:
2024 G20 M340i Melbourne Red/Cognac
2019 F87 M2 Competition 6MT, LBB, slicktop, exec pkg
2007 E91 328i Silver, slushbox, Eibach fr/E93 M3 rear sway bars, ARC-8
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