SIDEZ, since my last post I got with Renntech about the ECU remapping. I was told that part of the process of remapping is to do with the octane of the fuel, I'm told that the OEM program in the ECU is for 91 octane. Part of their remapping the ECU is changing it to 93 octane if it is available in the location that you live. I'm also told that the "resetting or relearning" will possibly effect their remapping program and they recommend not to do the resetting process. So all you guy's out there that has had an ECU upgrade I would not do the resetting process. I would still like to hear from any of the SRT6 guy's out there that have the Renntech pulley & ECU kit on their cars to get some info before I buy one.