I had a tuner chip on my harness when I bought my truck.
It went out on me some time ago.
Recently got my tranny working much better and would like something back on it again.

Lots of great options for $400 and up.
Are any of the less expensive 100-200 plug in boxes any good?...
Let me know your experience.

I don’t need one. But if it can gain some mileage and run better I’m interested.
Thanks