I'm currently at APR stage 2 version 1.2 and am very satisfied. I hear there are newer versions. Is it worth it to update to the latest? Will it help with passing emissions? Better gas mileage? What have you guys noticed with version 3? (I think it's up to now)
Most people that do the upgrade like it and don't have any problems. I had an issue with the throttle being really sensitive at idle and surging issues, so eventually I got rid of their tune. There's just a handful of people like me that had/have issues.