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 all 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 are able to spool faster and hit target boost quicker.  The outcome is more power sooner, resulting in faster 0-60 and 1/4 miles times.  If you are planning 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 greatest all-around investments for your G8X.   

Features:

• Increased Power and Torque
• Faster Turbo Spool
• Improved Exhaust Note

What's Included:

• ARM Catted Downpipe
• Mounting Hardware