RENNtech Hand Held TunerTHE HAND HELD TUNING MODULE TUNE OR STOCK ON THE GO The RENNtech Hand Held Tuning Module creates significant gains in horsepower and torque across the vehicles entire power band. By modifying ignition timing and throttle mapping, optimizing air to fuel ratios, increasing the engines rev limiter and modifying boost mapping for turbo charged vehicles, RENNtech performance software unleashes the true potential of your Mercedes. RENNtech HHT (Hand Held