CTS Turbo F90 M5/M5C & F91/92/93/M8 High-Flow Cats are engineered to maximize exhaust flow for the biggest power gains. Don't compromise your performance and sound with factory parts. Designed using the latest CAD technology, this part is made to perfectly fit in place of the restrictive factory catalytic converter. Manufactured from cast T304 stainless steel, hand TIG-welded, and back-purged to ensure years of reliable performance.

Besides unleashing the power and performance of your 4.4 Twin Turbo, our High-Flow Catalytic Converters will make your vehicle sound like it's meant to. When installed with the factory exhaust, it produces a louder, deeper roar with a much more pronounced exhaust "pop" on downshifts. During upshifts, you'll enjoy a confident "pop!" as you shift through all eight gears. The sound will be even louder if you already have an aftermarket exhaust system.

• Tube diameter: 80mm or 3.15"
• Catalyst size: 110mm OD x 90mm Long or 4.33" OD x 3.54" Long
• Includes 200 cell sports catalyst
• Designed and tested on a real car in the real world
• Cast T304 stainless steel, TIG-welded back-purged construction
• Replaces restrictive factory catalytic converter
• Awesome power upgrade with uncompromising performance
• Incredibly sporty exhaust note, subtle when cruising
• No drone with factory exhaust

Contents:
• Downpipe set