99gtstang08

So I bought a Diablo Sport 1 bank chip about a year ago but never did anything with it. I bought it used and I have always been affraid to use it because I heard that it could possibly break the ECM. I am thinking about installing long tube headers and I would like to tune the computer after installation. I live near Kansas City, Missouri where can I take the chip to reprogram it? Also, is it possibly harmful to the computer? Any help is appreciated.

Details about the possible setup,

Car: 2000 Mustang GT

Exhaust: Hedman Torkstep long tube headers, mac prochamber with high flow cats, and stock mufflers that are gutted.