These Motion Raceworks LLC trim rings are the perfect way to finish your front exit/fender exit exhaust, bull horn setup. This is the perfect option for getting exhaust out the front of your turbo car, nitrous car, supercharged car where clearance for rear exit is impossible due to exhaust size, or you wish to not put the exhaust on the ground in front of your tires. CNC laser cut from 6061 aluminum, and then black anodized for a great look. These trim rings are .5" Oversized from the size exhaust they are specified for (these trim rings are approx. 3.5" ID). This allows for exhaust movement and a perfect air gap between the tube and the trim ring. Rivets are included for installation, this provides a secure easy installation.