ARM 6" Downpipe for BMW 240i/340i/440i/540i/640i/740i (B58)

Overview

The ARM 6" B58 Downpipe takes the title of being the largest catless downpipe available for the B58 platform! The sound coming from your B58 with the 6" section of the ARM B58 Downpipe will astonish you. Even deeper tones, even better sound, and improved turbo spool.

The ARM 6" B58 Downpipe is one of the foundational upgrades for giving your B58-powered BMW more power, torque, and sound. The stock B58 downpipe comes from the factory with a catalyst that severely restricts exhaust flow, causing excessive backpressure with increased boost. Upgrading to the ARM 6" B58 Downpipe unlocks power, improves turbo spool, allows you to safely run stage 2+ tuning, all while improving the sound of your B58-powered BMW.

Details

Highlights

• 6" High-Flow Section
• Improved Exhaust Sound
• Faster Turbo Spool
• Safely Flash Stage 2+ Tunes
• SS304 Stainless Steel

Construction

• SS304 stainless steel and is TIG welded
• Two O2 sensor bungs to allow for reinstallation of the OEM oxygen sensors
• Connects to OEM midpipe or the ARM B58 Midpipe Upgrade
• OEM downpipe mounting points

What's in the Box

• ARM 6" B58 Downpipe

Enhance the Sound of Your B58

The ARM 6" B58 Downpipe will noticeably increase the overall volume of your B58, open up the exhaust burbles even on OEM programming, and make the turbo spool significantly more audible.

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