Parts for 2001-2006 BMW E46 M3. A future classic, the E46 M3 is a surprisingly affordable track car. Take care of the rear-subframe reinforcement; rod-bearings; and VANOS, and you have a fast and reliable track car. They are great right out of the box and get even better if you add lightness. Popular upgrades include switching to a "square" set-up (use the rear wheel size in the front too); increase negative camber; get some coil-overs; ditch the heavy stock seats; and improve the brakes.