3″ Exhaust Back Box Delete – BMW 1 Series F20 M135i 3.0 N55 12-16

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. Designed to fit the original exhaust system High flow design replacing the OEM silencing back box 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