quick view Add to Cart Roush ROUSH 2015-2017 Ford Mustang ACTIVE Exhaust Upgrade Kit (Requires ACTIVE-READY Exhuast Kit) - 421926 MSRP: $1,769.99 Convert your ROUSH Quad Tip exhaust to a full Active exhaust and take control of your Exhaust note. Our Active Exhaust upgrade kit makes any ROUSH passive quad-tip exhaust into an active exhaust that allows you to ?tune? your exhaust note using our iOS... Add to Cart Add to Wish List Add to My Wish List Create New Wish List Compare