Gravity Performance back box deletes are designed and manufactured to enhance the sound and appearance of the rear of your M135i. All systems are designed in house using the OEM mounting points to ensure smooth fitment every time.

Manufactured from highest quality T304 grade stainless steel
Mandrel bent and fully TIG welded for strength and durability
Polished 3.5′ tailpipes designed to fit beneath the OEM rear valance
Designed to fit the original exhaust system
High flow design replacing the OEM silencing back box