The onyl thign I could recommend is OBDII diagnostic software. Basically you buy a few cables nad are able to hookup a laptop to your OBDII diagnostics port and are able to MONITOR vital engine sensors.
As far as tuning goes you've got me stumped. It's a Bosch ECU if that helps.
I know you can buy carsoft to do a few things to the electronics on your car but I have herd bad things about carsofft so what does the dealership use for diagnostics?
The dealer uses a computer called the Group Tester 1, a.k.a. GT1. The independent shop I work at has one but it was $16,500 so not many places besides the dealer have it. You can only change certain things with it, its main use is for diagnosis and trouble shooting, not programing computers.
hmm thats just a little out of my budget. well good to know.
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