Not sure which 2003 Jeep Wrangler Performance Chips & Programmers are right for you? We have over 2919 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Timothy K from Victoria, BC said, "I reprogrammed my stock 4.0 litre 2003 Jeep with the Hypertech Max Energy Programmer, the reprogramming was simple, just fllow the instructions. I was able to set the RPM limit 500 rpm's higher, and programmed for horsepwoer/torque on 86 octane fuel. I could feel the immediate different, the lower rpm torque could be noticed, but the biggest improvement was at higher altitude, the power was there, that wasn't before. I was not afraid to pass slower traffic, as before it took considerable distance to pass slower moving vehicles. It also can clear or diagnose most error codes, which is helpful."
Year Range For Jeep Wrangler Performance Chips & Programmers