Fabspeed Motorsport just released catbypass/downpipes for the BMW 135i/335i. The catbypass/downpipes bypass the primary catalytic converters coming directly off the Turbo. They are a direct replacement for the OEM primary cats and just make night and day difference in the performance of the vehicle. Thanks to AutoCouture Motoring for bringing in the vehicles for all R&D and Dyno Testing. The most simple and easy way to increase big HP and TQ on your Twin Turbo without a CE Light.

• Fits 2007+ 135i Cars and 2006+ 335i Cars
• Manufactured from the highest quality 16 Gauge T304SS, CNC Mandrel Bent Tubing for maximum flow and least restriction.
• Water Jet Flanges for extreme precision and fit and TIG welded for ultimate Strength, Quality and Durability.
• Direct bolt on Replacement for OEM Primary Cats with O2 Ports.
• Full 2.75" Tubing from the Turbo for maximum exhaust speed and less backpressure off the Turbo.
• NO Check Engine Lights (O2 Simulator Included).
• Greatly reduced Turbo lag and much faster Spool-up.
• 25+ Horsepower and 30+ Ft. Lbs. of Torque Increase at the Wheels and more in other areas of the RPM range (Dyno Results below).
• Small sound improvement also with stock exhaust.

Fabspeed Catbypass Downpipes Video: YouTube - BMW 135i/335i Twin Turbo Fabspeed Catbypass/Downpipe

Fabspeed Catbypass Downpipes Dyno Result:

 

Looking Good... First I need to get some Coilovers, then its on to Downpipes, and an upgraded FMIC. If I can keep the car long enough...


This isnt one of those threads where the first post in the thread gets free downpipes??

 

Sounds really good for stock exhaust. Very nice for the N54 folks. Any plans for developing DP's for the N55 single turbo engine?

 

Fuel&Fire: Sorry no freebies for the first post---I will P.M. my best price for the systems.

Mtechnik: We will have those available soon. We are going to build the N54 systems first and within the next two months, we will have the N55 DP's available.

 

The O2 simulator, is it mechanical spacer or ECU reprogrammer? and how will it impact the BMW warranty?