Diable came from Motorhaven - very good deal. Superchip came from TroyerPerformance. Members of this site get a very good break in price as well. Probably the best price on the web unless you can find something on EBay. I would worry about EBay since both tuners become VIN locked with the first load unless the original factory tune is put back.

As for adjusting params. I haven't yet other than tire size; but, could also use some advice on this. During hard acceleration, the superchip causes my tranny to hop at each shift point.

My son and I added the Magnaflow SIDO yesterday. First off, this was somewhat of a pain. The hangers that come with the muffler and designed to mount into factory cutouts in the frame; but, don't allow the tailpipe to be properly adjusted. We are going to get aftermarket hangers and set them when they need to be. As for performance...... Between the superchip (Only 87 tune until next fillup) and Magnaflow... Very very nice improvement. Volant should be hear within a few days. It's next.