I purchased an SCT Tuner Programmer about 5 months ago from fastpartsnetwork (Torrie) and I never got to the dyno but it seemed to have more power by seat of the pants. It also allowed the fan to come on sooner and idle better. BUT when I noticed my car running and smelled a little rich I decided to flash it and put in the mid octane tune, it resulted in completely ERASING my stock program and I did NOTHING different than the times before. I sent the tuner and PCM to SCT at their request and they still have my PCM and tuner going on 3 weeks and won't respond to my phone messages or emails. I had to purchase another PCM from Moparparts.com for $450 and Im waiting for it to come in so I can drive my car. (96' Viper GTS) When I did speak to a customer service rep at SCT, he stated that this has happened to other Vipers and other cars in the past. I told him that I suggested they list the possible and potential problems that may happen by using the SCT programmer. I don't reccomend SCT for these reasons and suggest getting all the information about what ever you decide to buy so this doesn't happen to and your car... Dalton Vaughn Albuq. NM