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

New

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

£332.99 inc VAT (£277.49 + VAT)

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

Available to order

Fpr Gravity Performance, JapSpeed and Direnza products this is not guarenteed stock availibility and is available to order on demand

Estimated delivery by 01/05/2026