These units enable to total removal of the servo motor and cables controlling the butterfly valve in the exhaust. This allows for total free flow without any restrictions. If you try to remove the cables without this you will get warning lights and possibly 'limp' mode as the bike will self diagnose a problem. With these units in place the whole weighty servo motor assembly and cables can be completely removed. Available for the bikes listed below and maybe some others as supplier adds more. Just ask if your model is not listed.