Lingenfelter Corvette Supercharger Boost Bypass/Valet Mode Kit, with key switch
(new $355.00) never installed, I no longer have my 05.
(works with Magnuson style chargers, this allows you to dial in your desired boost rpm. So if you do not want your supercharger to come in until 2000 rpm (or what ever RPM you want) dial it into the RPM controller box. It also has a provision for turning off your boost all together via a keyed switch (included), great for Valet parking.)