Close out your lower rear bumper and add rear downforce Our Rear Diffuser is race-bred and functional, but also perfectly at home on a street car. As with all of our professional-quality carbon, this piece bagged and autoclaved to be extremely strong and light. Extends all the way forward to the factory rear fuel evap box, which provides the axle-back flat floor from the factory. Attaches to stock bumper trim mounting points. Requires slight modification of fuel evap box and reversible modification to bumper. For use with BimmerWorld E46 M3 Exhaust line (Diffuser Exit variant only) - this exhaust section is designed specifically for use with this diffuser - diffuser does not work with any exhaust section using the standard left cutout in the stock factory bumper insert.
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