Is 'X' street legal?
Exhaust systems for OEM non-emission control system equipped motorcycles, as well as slip-on mufflers that mount downstream of and which do not inhibit the proper function of emission control systems, are considered legal replacement parts by the California Air Resources Board (CARB). This is the same for intakes, air filters and fuel system parts that do NOT modify OEM emissions systems. CARB does not, however, permit the use of aftermarket exhaust systems or fuel/air control systems that remove or alter OEM emission control devices unless certified by CARB, other than on racing vehicles on closed courses. More California exhaust, intake, and fuel system information is available at www.arb.ca.gov.
Products shown may be designed, manufactured, intended and sold for use on competition vehicles that are operated only on closed course racing circuits unless otherwise noted, and use of the same on public roads or lands may be a violation of local, state and/or federal laws. By offering products for sale, Starcycle/WME and its suppliers make no representation or warranty as to whether the items offered for sale are legal for the use for which they are purchased.
Remember: smog/emissions legal ≠ EPA legal! There may be sound level requirements and even non-tampering rules in effect for your vehicle. Always check your applicable local laws for any regulatory compliance/non-compliance information.
As a general rule: vehicles manufactured after 2004 for road use have emissions equipment in the mufflers (3 way catalysts). Many bikes built previous to this but after the mid 1980s have emissions equipment upstream of the muffler (air injection, catalysts, lamda sensors). Most, but not all, bikes made previous to this do not have emissions controls in the exhaust. You should check with the vehicle manufacturer if you're unsure about changing any emissions equipment, and always check with local authorities regarding legal status of modifications. Many municipalities consider modifications made to vehicles that have the purpose, or result, of increasing sound to affect the road-legal status of the vehicle.