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1997 BMW 528i E39

Already Tried:
i am on a very tight budget due to a recent layoff and wish i could afford to pay you more, i apologize for that as i know that your time and knowledge are very valuable. my girlfriend bought this car on ebay two years ago. we flew to chicago and drove it back to phoenix. about forty miles outside of chicago the ac compressor pully wore a hole in the bypass hose for the radiator and the car got hot. hot enough to crack the thermastat housing.I repaired the hose and thats when i found out the therm. housing was cracked. I put two cans of bars in it and we drove to iowa, doing 45 mph on the shoulder because the car would not come out of S2 due to a wet sensor on the tranny. once in phoenix, i had to have 700 dollars done to the car to get through emissions. are there any other means of tuning or accessing the computer on this car that will help with performance? thank you again for your help