I have a 2017 Gold LE Rock Crawler. I ordered a Dynojet tuner from Aftermarket Assassins and it came in yesterday. It is my first tuner of any kind on any vehicle. I hooked up the tuner to my diagnostic port and it saved the contents of the ECU to the tuner. However, it could not find any compatible tunes for my ECU on the tuner. About 8:00 p.m. last night I emailed Aftermarket Assassins and an hour later I had response asking me to send me the saved stock tune. I did that and by 11:00 a.m. today I had a new tune file that worked. It turns out the Rock Crawler has a different base tune than the standard XP with improved fuel mapping. What fantastic customer service. He was on the road and read my email and within a few hours he had a solution. Thanks, Aftermarket Assassins.

Utah RZR Rentals