Just over a year ago I decided to try open track time in my 2013GT500. Out of the factory the car had plenty of power and not bad handling for a muscle car. I loved the track time so much I decided it would be worth upgrading the car. So far Cortex has installed their patented suspension system, Borla headers and exhaust, HRE rims, roll cage and racing harnesses. The car is a completely different car now, now it not only is powerful but it handles incredibly! Even better I have found Filip and his crew to be so easy to work with and honest. If you are going to trust somebody to upgrade your car, save your money and do it right by having them do the upgrades. Some of the best money I have ever spent!