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

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

even more on a vehicle with higher flowing cats

Whilst not required

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