[99 T/A Owner]

Thanks for the inputs so far. Yea, I've only recently heard of the chasis dyno wondering how people liked them and also never heard of getting a "speed density" tune until the other day (apparently I'm falling out of the loop... I'm just wondering what the differences are and why they significantly more expensive than just a regular tune (cause I'm used to seeing $400-$500 for heads/cam tunes), and if this "speed density" tune can be performed on only the chassis dyno or both.