18s will work fine on the coupe..some of the guys that will respond.. have never done it..as long as you have a coupe you can make any e46 OEM wheels fit. the 18s dont require that you stretch the tires..alot of people have done it. Ive had 19s oem and made them fit without rolling fenders..
like i said a coupe even 19s will be possible..
sedan..the limit would be oem 18s..even then youd have to roll fenders to drop it..
from pictures of thempower
sedan clearance..the coupe will have alot more room
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