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Does it hurt the car? If you're driving it rough, it's the same as driving it rough with no tune. As long as you take care of equiptment and use good fuel I doubt it would hurt the car any more then regular use.
I like it a lot. Quicker out of the hole. It will lay a nice scratch in drive with no left foot. I'm chicken, I lowered the rev limiter from 6300 to 6000 and reduced the wot shift mph slightly. Shifting is great, although I went +5% on the 2-3 shift pressure. I also tweeked the fan settings slightly and changed idle rpm slightly. I honestly didn't notice a difference between the 87 & 91 perf., and the 91 Torqueseemed like the weakest of the three.
Edit: Sorry Dug5spd, you sound like a manual. Forget the Automatic talk. But I do like the tune.