Increasing Power And Reducing Sound Just Got Easier!

The unique patented design of plugs and disks on these collector inserts actually helps pull the exhaust gases through the exhaust system, increasing power in the process, while decreasing sound. For drag racing, they simply slide into the collector and are secured with the three bolt flange. For street cars with a full exhaust system, the insert slides into the collector and sandwich the welded insert flange between your collector flange and reducer flange. NHRA legal. 7'' long.