G90 G99 M5 SQ Dry Carbon DiffuserOEM+ Aggression Precision Fitment LAB Approved Upgrade the rear profile of your G80 M3 or G82 M4 with the SQ B Style Rear Diffuser a motorsport inspired carbon fiber upgrade engineered to deliver OEM level fitment with a more aggressive, defined rear end presence. Designed to integrate seamlessly with the factory bumper, the SQ B diffuser adds depth, sharper lines, and a wider, more planted stance without disrupting the OEM design language. Clean.