C5 front brakes will fit inside all the factory 17" wheels found on the 4th gens. I believe you can get C6 calipers on there as well. They are slightly bigger than C5 calipers.
One thing to pay attention to when decided 17" or 18" is tire selection. I can't see it becoming a problem any time soon that tire selection would be limited on a 17" rim but it's something to keep in mind. Other than that, it's mainly a looks thing.
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Trey
Current ride: 2001 BMW 540iT soon to be manual swapped.
Former rides: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
00 BMW 540i/6: Suspension, wheels, and ACS bits.
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