Cuztom Tuning Carbon Fiber Quad Exhaust Tips — G20 3 Series

Fitment varies by model, and it's worth understanding before you order. On the M340i, this is a true direct replacement — remove the stock chrome rectangle tips and bolt these on in their place, no cutting or modification needed. The oval-shaped inlet is sized to mate with both the factory M340i exhaust and the BMW M Performance exhaust system. For 330i and 330e owners running the standard dual exhaust setup, a rear diffuser change is required to open up the quad-tip apertures, and some modification to the existing exhaust piping may also be necessary. Always cross-reference your inlet size against the product dimension photos before purchasing.

Cuztom Tuning engineered practical details into the design as well. Venting and drain holes are built into the interior of each tip to release trapped heat and channel out condensation — a thoughtful touch that protects both the tips and the surrounding diffuser over time. The polished stainless steel interior contrasts cleanly against the gloss carbon exterior for a finished, purposeful look rather than a dressed-up aftermarket appearance.

For M340i owners especially, this is one of the most straightforward and visually impactful upgrades available for the G20 chassis. The jump from twin to quad exits reshapes the entire rear aesthetic in a way that spoilers and diffusers alone can't match — and it installs in an afternoon with basic hand tools.