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Price: $227.50
High performance catless downpipes for N54 engine (twin turbo). Set of 2. Fit E82, E90, E91, E92, E93. Recently removed from my 2008 135i.
MY CAR PASSED EMISSIONS WITH THESE INSTALLED.
It is said that these increase horsepower by 25 and torque by 25 footpounds. Make your car into a BEAST!
MANUFACTURER SAYS:A turbo impeller wheel speed is mostly limited by the exhaust back pressure within the system. If one could eliminate some or most of this exhaust back pressure, the turbo will spool that much faster and effortlessly resulting in quicker engine revs and increase HP. The Active Autowerke Signature 135i downpipe is designed with the intent to maximize in power. The downpipes are created with the least amount of restrictions possible by utilizing a full 3\" piping throughout with the least amount of bends possible, that is impressive when compared to the factory diameter of 2.50\". What you will experience is a faster, more responsive engine because the turbo impeller now has the ability to spool that much faster. The end result is more power from your BMW 135i exhaust. For added durability, factory like support braces are also implemented to alleviate stresses upon the turbos. Made from 304 stainless throughout ensures a robust and durable exhaust that will provide trouble free performance with the longevity to match. All flanges are 304 stainless with the 0.060\" wall thickness (~1.5 m.m.)KEY FEATURES:-Designed with less restrictive curves and more straight flows-Full 3.00\" diameter piping throughout allows for maximum power output-Quicker turbo spool-Durable construction from 304 stainless with 1.50mm wall thickness-Precise fit installation-Full down pipe exhaust support braces relieves load bearing stressMANUFACTURER\'S DISCLAIMER:These parts may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event. but my car passed emissions testing just fine with them installed.