HIGHLIGHTS • Gain up to 23whp/29wtq• Faster Turbo Spool• Improved Exhaust Sound • Upgrade to Stage 2+ Tuning • SS304 Stainless Steel PROFILE An F30 N55 Downpipe is regarded as the best hardware upgrade to get the most power from your N55 powered F3X BMW. The stock N55 downpipe comes from the factory with a catalyst that severely restricts exhaust flow. Upgrading your downpipe unlocks power, improves turbo spool, allows you to run stage 2+ tuning, and increases the exhaust note of your N55 powered BMW all at once. An N55 downpipe upgrade is the first hardware upgrade every N55 owner should invest in. ENHANCE THE SOUND OF YOUR N55 The M235i in the video below is only equipped with the ARM N55 4" Catless Downpipe, it is otherwise on a 100% stock exhaust. The car has never even been flashed, it is on the original DME programming from BMW. The ARM N55 Catless Downpipe will increase the overall volume of your BMW, open up the exhaust burbles even on OEM programming, and make the turbo spool significantly more audible. CONSTRUCTION The ARM N55 Catless Downpipe is built with mandrel bent SS304 stainless steel and backed by the ARM Motorsports Lifetime Warranty. The ARM N55 Downpipe starts with a 4" diameter at the precision CNC machined turbo v-band connection and gradually reduces to a flared joint to optimize exhaust flow while matching up to the stock midpipe v-band connection perfectly. The ARM N55 Downpipe features two O2 sensor bungs to allow for reinstallation of the OEM oxygen sensors. The O2 sensor bungs are located higher up on the ARM downpipe to avoid stretching the O2 sensor wires during installation. A tune or CEL Delete will be required to avoid a check engine light from displaying on instrument panel. IMPROVED EXHAUST SOUND In addition to helping your N55 make more power and torque, it significantly improves the exhaust sound. While the downpipe only accounts for approximately 20% of the entire exhaust system, upgrading it will produce a noticeable increase in volume, especially under full throttle and on cold starts. If you're looking for a more extreme sound, you can pair the ARM downpipe will a full exhaust. The ARM N55 downpipe is compatible with any aftermarket exhaust that can connect to the stock N55 downpipe. IN THE BOX • ARM N55 Downpipe FITMENT GUIDE The ARM F-Series N55 Downpipe is designed to fit the vehicles listed on the chart below with a 4" EWG Turbocharger only. Make Model Submodel Engine BMW F30 335i N55 3.0L BMW F30 335i xDrive N55 3.0L BMW F32 435i N55 3.0L BMW F32 435i xDrive N55 3.0L BMW F33 435i N55 3.0L BMW F33 435i xDrive N55 3.0L BMW F34 335i xDrive N55 3.0L BMW F36 435i N55 3.0L BMW F36 435i xDrive N55 3.0L BMW F87 M2 N55 3.0L
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