Powerflex Road Series Rear Subframe Front Bush Insert – BMW F20 | F21 1 Series | F22 | F23 2 Series | F30 3 Series | F32 | F33 | F36 4 Series S-AMG (W222) Our system replaces the airboxes

Our system replaces the airboxes with Venturi housings which transition much more efficiently to the circular MAF tubes maintaining laminar flow

The face of the airbox is in direct line with the top of the engine where the turbos are situated

it provides drive to both wheels without the handling issues that traditional clutch type diffs create (there is no tendency to push/understeer with a Wavetrac)

Additional 110hp & 150lb/ft on a stock vehicle

It is well known that the Primary cats are a major restriction point on the E9X M3

Powerflex Road Series Rear Subframe Front Bush Insert – BMW F20 | F21 1 Series | F22 | F23 2 Series | F30 3 Series | F32 | F33 | F36 4 Series S-AMG (W222) Our system replaces the airboxesPrices shown are per bush. 2 bushes are required This is a polyurethane insert that fits into and fills the voids in the original bush to reduce subframe movement. OEM Part Number: 33316792509 Suitable for: M135i M140i M235i M240i 335i 340i 435i 440i