ARM Downpipes for BMW F10 550i (2-Bolt Flange)

Overview

ARM Motorsports new N63 Downpipes with the 2-Bolt midpipe flange for the 4.4L V8 Twin-Turbo powered 550i allows you to take your N63 engine to the next level. Made with full 304 Stainless Steel and 3" construction these downpipes provide a significant increase in power and torque over the OEM catted downpipes. In addition to the massive power gains, these downpipes open up an incredible exhaust sound from the turbocharged V8 that will shock and awe onlookers!

By replacing the OEM downpipes with the ARM Catless Downpipes, you'll be removing the restriction from the OEM converters which will reduce exhaust back-pressure and allow the exhaust from the turbochargers to flow more freely. This increase in exhaust flow allows for the turbos to spool faster, increasing power and torque throughout the RPM range of your 550i.

Details

Highlights

• Gain up to +43whp / 48wtq
• Improved Turbo Spool
• Enhanced Exhaust Note
• Fully Reversible

Construction

• Mounts to turbos and midpipes with the same precision as you would expect from the factory 550i downpipes
• Flex section to relieve stress between the upper and lower portion of the downpipe from engine movement during aggressive driving
• Two O2 sensor bungs on each downpipe to allow for reinstalling the O2 sensors in their factory locations

What's in the Box

• ARM N63 3" Downpipes
• ARM Crush Brackets
• Hardware Kit

Dyno Proven

Our test car was an N63-equipped 2012 550i GT optioned with the all-wheel drive xDrive system. It came with a Stage 2 tune installed making our baseline numbers 412awhp and 482awtq. After installing the ARM 3" Downpipes and Cold Air Intake, we recorded gains of 48whp and 43wtq over the standard Stage 2 tune for an impressive total of 460awhp and 525awtq.

Warranty & Off-Road Use

Every ARM Motorsports product is backed by a lifetime warranty which is automatically issued at the time of purchase. Your warranty protects you against any defects in craftsmanship or fitment. The warranty entitles you to a replacement unit. This product is for Off-Road Use Only. Items sold for off-road use only are illegal to use on public roads in most states and provinces. This product is intended for racing vehicles which may never be used on a public road.

Fitment

Watch: Video 1, Video 2, Video 3