I want to purchase a predator tuner for my 05 300C. I have a cherry bomb catback (not glass packs), a drop in K&N, and I plan on purchasing a set of MotoBlue headers with the high flow cat mid pipe. I want to also add a 180 thermostat and Diablosport tuner. I was looking at some older diablosport models on ebay/craigslist/forums and was wondering which models are no longer effective on my car? I know the functions vary on different models, but I've heard that some will not give me any features at all. I don't want to buy the wrong programmer, but I would like to save some cash, especially after taxes. If anybody could break it down for me or maybe just post a link that I missed it would be very helpful. Thanks.