(beware internet shops pre-selling our kits, that are not official GReddy Master Tuner Shops)
One such GReddy Master Tuner Shop is SP Engineering and they have been giving us some feedback on a pre-production kit they have on a USA-spec GTR, with a stock engine. With their tuning methods they were able to increase horsepower by 305whp and 643.9 ft/lbs at just 1.45kg/cm2. That makes a 700+whp GTR. We are looking forward to seeing how much more they and the other GReddy Master Tuner Shops can make with our GTR twin turbo upgrade kit!
Other great tuning options for the GTR include our: