The ARM S58 Catted Downpipes increase power and torque on your S58-powered BMW while unleashing exotic sounds from your tailpipes. The ARM S58 Catted Downpipes are one of, if not the best, around hardware upgrades for the G8X platform. The ARM S58 Catted Downpipes improve throttle response throughout the RPM range while stepping up the exhaust note, all without the need to replace the entire catback system on your S58.

By reducing backpressure on your S58's turbos, you can spool faster and hit target boost quicker. The outcome is more power sooner, resulting in faster 0-60 and 1/4 miles. If you plan to tune your S58, this will benefit your G8X even more, as the backpressure will increase on S58's running higher than OEM boost. Making the ARM S58 Catted Downpipes one of the most significant all-around investments for your G8X.

The ARM S58 Catted Downpipes will increase the overall volume of your exhaust, make the exhaust burbles more audible (even on OEM programming), and make the turbo spool significantly more noticeable.

CONSTRUCTION

The ARM S58 Catted Downpipes are built with SS304 stainless steel and backed by the ARM Motorsports Lifetime Warranty.  The ARM S58 Catted Downpipes start with a 3" diameter precision CNC machined turbo v-band flange. 

Each downpipe utilizes a 200-Cell High-Flow Catalyst.  

The catalysts will replace the resonators in the catless/resonated downpipes.  The catted version sounds similar to the catless variant but will help with some exhaust odor.  The catted S58 downpipes will likely still produce a CEL.  You will need a tune or a CEL Delete Kit to remove a CEL. 

The set's longer downpipe (front downpipe) utilizes a reinforced flex section.  The flex section is incorporated into the long downpipe to relieve stress on the turbo during aggressive driving.

Both ARM S58 Catted Downpipes then transition to a 2.75" 2-Bolt connection to secure seamlessly to the OEM S58 midpipes or any aftermarket mid pipes that connect to the OEM downpipes.

Kit Contains:

• ARM S58 Catted Downpipes

• Midpipe Connection Mounting Hardware