I also have salvage title on my car, but I don't notice any difference so it doesn't bother me. Like natestang07 said I would definitely get a tuner and a new tune, that way you know what your working with. I would just do some research online to find which tune will be best for you. Just my .02
Good maintenance is needed for sure. My one is at 105,000 miles and I recently had the check engine light on after a wild driving session. Needed to replace the sensor, now all ok. Recommend to check the shock absorbers as well. With little maintenance, expect to keep her alive much longer.