BMW 135i/335i 4" Catless Downpipe for N55 Single Turbo

Ultra low backpressure 4" downpipe
23HP gain over stock at the same boost level with no tuning devices
30TQ gain over stock at the same boost level with no tuning devices
Straight shot design for zero restriction and high velocity
Largest possible tubing for quicker spool
Zero taper on flange at turbo for largest possible pressure differential
Largest downpipe on the market, uses more 4" tube than the competition
Reinforced brackets for proper support on the turbo and manifold assembly
100% Made in the USA
Optional: Ceramic coatings normally used for race pistons for much greater thermal barrier protection compared to exhaust coatings

What's in the box:

Qty 1- Berk Technology 4" 304 stainless steel downpipe

Qty 2 - Berk Technology Gaskets
Qty 8 - Nordlock Vibration Proof Locking Washers

Qty 4 - Mounting Bolts

Qty 4 - Flange Nuts