by: Active Autowerke
Sold Out - $ 499.00
BMW introduced a new single turbo version of its direct-injection engine for the popular 135i and 335i models beginning in 2010. The N55 was the successor to the popular N54 – which was certainly a hard act to follow. Although not as warmly received, the N55 still offers enthusiasts plenty of tuning potential.
The Active Autowerke N55 downpipe for the 135i and 335i helps unleash that potential.
Turbochargers are powered by spent exhaust gases created during the combustion process. The quicker these gases are evacuated, the better. Unfortunately, the factory down pipe in the 135i and 335i is quite small, which restricts exhaust gases and slows turbo spool.
The Active Autowerke N55 Signature down pipe utilizes 4” diameter stainless steel piping in order to provide more power, quicker spool, and extreme durability.
The speed of a turbo’s impeller wheel is limited by exhaust back pressure. A larger down pipe relieves some of this pressure, resulting in quicker and more efficient spool. With Active Autowerke’s Signature downpipe, your 135i and 335i can rev quicker, and deliver more horsepower and torque.
Minimizing back pressure while remaining daily drive-ability was the goal of our N55 downpipe. Owners can now upgrade to a product that is affordable, reliable, and easy to install. Note: Because this down pipe modifies the factory emissions system it is designed for off-road or racing use only.
After months of research and development, our engineers settled on a 4” diameter pipe which utilizes the least number of bends possible. However, the Signature N55 down pipe still fits easily into the OEM location, and makes use of the original support bracket. This reduces the weight carried by the turbo.
Constructed entirely from 304 stainless steel with 1.5MM wall thickness, we are confident that you’ll be pleased with how robust and durable this down pipe is. Trouble-free installation and a long lifespan ensure that you’ll enjoy many miles of performance in your N55-powered 135i or 335i!
$ 249.00 $ 299.00
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