BlackBoost FTA Adapter for Mercedes-Benz A45(S) AMG (W177) M139 2.0L I4 Turbo (2019+) boots resulting in more fresh air

resulting in more fresh air with less noise

7% Spandex

Seal Rings prevent debris to enter the chain which ensures the efficient horsepower transmission from the engine to the rear wheel throughout the chain life

which allows air to travel from the front of the housing to the rear

just remove the cover at the back of the helmet

BlackBoost FTA Adapter for Mercedes-Benz A45(S) AMG (W177) M139 2.0L I4 Turbo (2019+) boots resulting in more fresh airBlackBoost FTA Adapter for Mercedes Benz A45(S) AMG (W177) M139 2. 0L I4 Turbo (2019+) The BlackBoost FTA (free to air) adapter converts the factory diverter valve into a blow off valve by redirecting the compressed air from the turbo to be vented to the atmosphere instead of the air being redirected into the air intake. Features: No Tuning required No Check Engine Light Plug and Play Installation Machined 6 Series Aluminium Iconic Blow off sound The