This is my first post, I have an SRT6 and I've been looking at an ECU upgrade. I've contacted RENNTech and they have told me that just an ECU upgrade will not really gain much in HP without buying their pulley set too. I've also contacted UPsolute and they told me $400 send in my ECU and gain about 30 HP. I've also contacted a few other places and I am waiting for replies. I was wondering if any of you SRT6 guy's have done an upgrade, what was the name of the company, could you tell much difference in horse power and of course how much did it cost?