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I am also curious to know how the Superchips hand held tuner measures up to the others. This is probably a dumb question but is the Superchips Tuner the same as the SCT X-cal?
Before you invest any money in it I would see if anybody had any dyno results with it. Call a dyno shop that tunes Mustangs and ask them about the product and see if they have done a dyno with that product on.
You may get some increases but as I can tell it is a canned / safe tune. Small gains compared to the flash tuners (Diablo / SCT). Also, you cannot modify the tunes, so add a CAI and now you have to buy a real tuner. Change tire / wheel size, change gears... flash tuner needed. So it sounds good up front but there is no vertical upgrade path. I have heard that some can be reflashed for adds, but the cost after a flash may equal the handheld prices.
On my dyno i have had 3 cars come in with Jet chips ALL lost HP. 2-5 hp loss. Thought it was funny as hell. Then i tuned with SCT and bam. Happy and no probs.