ARM 3" Catted Downpipes for BMW N63/N63TU

Overview

ARM Motorsports new N63/N63TU Catted Downpipes for the 4.4L V8 Twin-Turbo powered 550i allows you to take your N63/N63TU engine to the next level. Designed with the same precision as our N63 Catless Downpipes, the ARM N63 Catted Downpipes feature high-flow 200 cell ceramic sport catalytic converters positioned in the OEM location.

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!

By replacing the OEM downpipes with the ARM N63 Catted Downpipes, you'll be removing the restriction from the OEM converters. This 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 N63.

Details

Highlights

• Gain up to +43whp / 48wtq
• Improved Turbo Spool
• Aggressive Exhaust Note
• 200 Cell Sport Catalysts
• Direct Bolt-On, Fully Reversible

Construction

• Mounts to turbos and midpipes with the same precision as you would expect from the factory 550i downpipes
• Two O2 sensor bungs on each downpipe to allow for reinstalling the O2 sensors in their factory locations

What's in the Box

• 2x ARM N63 3" Catted Downpipes
• 2x ARM Crush Brackets
• 1x Hardware Kit

Dyno Proven

Tested on an N63-powered 2012 550i GT xDrive with a Stage 2 tune, the addition of ARM’s 3" Downpipes and Cold Air Intake yielded +48whp and +43wtq, raising output to 460awhp and 525awtq. The catted version maintains nearly identical gains compared to the catless setup, while offering the benefits of a catted exhaust system.

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