Knowing that modifying any stock sled will cause issues, I went Silber last year. So clean with the reflash, I tried a few other turbos during the year, all very powerful but not the same response.... the bottom end was always impressive. Not saying piggyback is a bad option, every dealer who touched my sled last year flashed it, even when told them not to. So I did have some down time, at the end of the year I did have to replace the airbox(melted) but that's my fault for having too much fun and not letting her cool. Next year, app based flashing and venting will cure my "issues", can't wait!!