OK. I just found out that you need the support software for those 2 harnesses. I think I will just go with the preprogrammed unit then. ONLY, if it can still be programmed. In other words, its probably not programmed to be the most efficient, so I would take it to a shop to get tuned specifically for my car, and use the preprogram as a starting point.
What do you guys thing? Or should I sace that 40 bucks to invest in the tuning at the shop? An do you guys think the support software and harnesses will be worth the buy, how many more gains you think we can get out of those?