Supersprint BMW F30 3 Series, F32 4 Series & F35 Stainless Steel Centre Exhaust BFCM_M135i xDrive (F40) The factory S58 airbox is

The factory S58 airbox is designed to balance noise reduction

This can be done either via CAN bus (depending on the ECU values) or via additional analogue sensors

M440i Mild-Hybrid xDrive 4 Series Gran Coupe (G26) 2021-07–on M440i Mild-Hybrid

0T (B48 Engine - 252 Hp - models with OPF) 2017 -> 2018 (with valve)

ENET for F/G series BMW and Supra

Supersprint BMW F30 3 Series, F32 4 Series & F35 Stainless Steel Centre Exhaust BFCM_M135i xDrive (F40) The factory S58 airbox isThe Supersprint Centre Exhaust is a precision, direct fit stainless steel upgrade engineered for the BMW F30 3 Series, F32 4 Series & F35. It replaces the restrictive factory component to free up exhaust flow, sharpen throttle response and give your BMW a deeper, more purposeful note. Supersprint has been handcrafting performance exhausts in Mantova, Italy since 1955. Every system is designed and validated on the dyno not by assumption using thin wall