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


BT1855
$599.99
OUT OF STOCK

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
100% Made in the USA
Optional: Ceramic coatings normally used for race pistons for much greater thermal barrier protection compared to exhaust coatings