Originally Posted by Quadsbc
Just go stage2 with an opensource (custom dyno) tune from the start.
Otherwise, you're redundantly spending your redunant money over and over again.
Just do it once and do stage 2 at your tuner who can open source tune it right there and then. An AP is fine if you are going strictly the Cobb route (which means you're buying only Cobb stuff, which is pricey) but varying from there means there's no guarantee. You're on your own.