Subaru Impreza V5 Piston Ram Dump Valve (Flange Mounted) BMW > 1 Series > F20/F21 2012 Onwards > M135i 2012-2015 (N55) This gives the charge air

This gives the charge air an alternative route and allows the turbocharger to keep spinning so that when you accelerate again there is no "lag" or waiting period

and comfort

The above list is meant as a guide only

70mm Elbow 45°

Subaru Impreza V5 Piston Ram Dump Valve (Flange Mounted) BMW > 1 Series > F20/F21 2012 Onwards > M135i 2012-2015 (N55) This gives the charge airWe recommend servicing your valve every 3 years, or 20,000 miles, whichever comes sooner Alloy Atmospheric Ram Dump Valve, flange mounted available to fit the Impreza V5. Made from billet aluminium, this atmospheric diverter valve dumps the charge air to atmosphere creating the "Whoosh" sound most commonly associated with rally cars when the throttle is lifted. This increases both quicker throttle response and higher clamping load to maintain boost