Our B58 Catted Downpipe design incorporates a 6" high-flow 200 cell ceramic catalytic converter, making it a standout choice for those seeking power without while reducing emissions. 

The ARM 6" Catted B58 Downpipe replaces the restrictive factory downpipe with a 200 cell catalyst with a 6" diameter that significantly improves exhaust flow. This upgrade unlocks additional power and torque while reducing emissions compared to a full catless B58 downpipe, allowing you to safely run Stage 2+ tunes and enjoy a more vibrant sound from your B58-powered BMW.

Features:

• 6" 200 Cell High-Flow Catalyst
  
• Improved Exhaust Sound
  
• Faster Turbo Spool
• Stage 2+ Tune Compatibility

What's Included:

• ARM Catted Downpipe
• Mounting Hardware