Khrome Werks 4.5" HP Plus Quiet Insert Baffles Bolt-in optional quiet inserts for the Khrome Werks 4 1/2" HP Plus Slip On mufflers. These comply with the SAE J2825 sound test with no appreciable loss of performance. @tadt33
Still liking them ? Just got a set of 4.5 hp lis used and they are way to loud to live with on long trips . I kinda knew this might be a problem going in