# Exhaust The OEM exhaust on the C7 S6/S7 features a dual-muffler, valved system designed for refined sound and comfort, with active flaps that open under load for a deeper tone while maintaining quiet operation during cruising. # Exhaust Upgrades Popular exhaust upgrades for the C7 S6/S7 include valved cat-backs, resonator deletes, high-flow downpipes, and full systems from brands like Akrapovič, AWE, and Milltek to improve sound, reduce weight, and increase performance. # TGK Motorsport Driveshaft Tunnel Brace The TGK Motorsport Driveshaft Tunnel Brace is designed to provide enhanced clearance for aftermarket exhaust systems, replacing the shallow-fitting OEM tunnel brace. This upgrade enables the installation of larger diameter exhausts without inducing excessive rattling or vibration the larger exhausts coming in contact with the OEM brace. **Features:** - Enhanced Stiffness Compared to Factory OE Stamped Steel Part - Bent From 5MM Plate Aluminum - Black Anodizing for Corrosion Resistance - Offers an Additional 18mm of Exhaust Clearance Compared to OE Part, Facilitating Installation of Larger Diameter (Up To 1” Diameter Larger) Aftermarket Exhausts - Quick and Effortless Installation Process - No Increase in Noise, Vibration, or Harshness (NVH) Levels **[TGK Motorsport Store Page](https://tgkmotorsport.com/products/tgk-motorsport-driveshaft-tunnel-x-brace "TGK Motorsport Driveshaft Tunnel Brace")** [![image.png](https://www.c7wiki.com/uploads/images/gallery/2025-04/scaled-1680-/GSgHlG1F5UVtMyM4-image.png)](https://www.c7wiki.com/uploads/images/gallery/2025-04/GSgHlG1F5UVtMyM4-image.png)