The car can complete the quarter-mile in 9.9 seconds at 139 mph. Renntech has a new upgrade for the Mercedes-AMG GT63 4-Door Coupe. It’s called the RIIX (arr-three-ex), and it combines the ...

The Mercedes-Benz SL65 AMG Black Series is one of the wildest rides on the market, but for those who want a little extra, Renntech has just the ticket. With an upgraded ECU, intercooler and ...