The Curtis Sparks Racing X6 Stainless Steel Exhaust System is the ideal exhaust system for any application because of the power gains it produces through the entire power curve. Curtis Sparks exhaust systems are complete systems, not slip-ons, because they produce more performance with a complete system rather than working with the limitations of the stock head pipe. Some aftermarket exhaust systems are able to be used as a slip-on or complete system, but the problem is they’re still limited to stock diameters where the head pipe and rear section come together. Curtis Sparks has spent countless hours testing on the dyno, on the track with Pro-level riders and at the drag races to insure the most performance possible out of their exhaust systems. This exhaust system is offered in both the X6 Race Core and X6 Big Core systems. The X6 Race Core features a 2” outlet diameter which offers the best all-around performance and can be configured with a spark arrestor and quiet insert. The Race Core system is about 102db using SAE testing guidelines. The Big Core exhaust system houses a 2.25” outlet diameter which offers more top-end performance on built engines. The Big Core is about 110db using SAE testing guidelines. The Big Core cannot be configured with any quiet inserts. A spark arrestor can be installed in the Big Core system but the Big Core was never intended to use a spark arrestor. Running a spark arrestor in the Big Core will drastically shorten the arrestor’s life span.