One suspension difference is the 335is has different rear guide rods. Not a big difference but interesting that BMW beefed up that part.
OP: if you don't want to wreck the ride, you probably don't want to lower much more than 1-1.5" and look for a quality coilover.
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2007 E90 335i, TiAg, 6AT, ZPP, ZSP, ZCW, 6FL, HD
Quaife lsd, ETS fmic, GIAC s/w, Dinan intake/exhaust/oc, Koni/M3 susp, Apex Arc 8, Mich PSS
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