OBD2 plug and play horsepower, or placebo? I dig deep.

I test two OBD2 plug and play chip tuners, the spitfire performance chip and the stage 1 performance chip. first we look at what's it's actually communicating over various protocols, then we crack the cases open not just to look, but actually check out the specs of the chips that make them tick, finally I do a comparison with traditional tuning so you can see the differences. I hope you enjoy and learn something new.