For all the Mercedes 55AMG/600/65AMG driver's we offer a 'Full Manual' option. When you select the manual option the car 'will not' upshift for you even if you redline the car.
This option can be requested when we programme the transmission control unit (TCU).
Again we were the first company to offer this option in North America, we've been doing it for a while now.
Just to let you guys know and we should have listed this along time ago but we're also able to programme the TCU (transmission control unit) in all the Mercedes 55 AMG Kompressor's. We can raise the tq limiters, etc. in the control unit.
This is included in the 55 AMG Pulley/Software Upgrade.