The only matinance I am really doing is plugs, checking for boost leaks, and cleaning the engine bay. My car is away because it is way to low to the ground to run through the snow and I hate salt.
The MTM ecu was on the car when I bought it ( I didn’t know that at the time of purchase nor did the dealership) I love it and so does everyone who has gotten a ride in my car (including many people who have experiance with GIAC and APR).