I sell uprev and what they're offering is just a license and a tune and not the cable to go with it, e tuning is great as u get real driving conditions from the data, dyno tune is great with the right tuner, I reccomend randy baker to tune u, he is the godfather of tuning for nissans, he tuned my truck and my 350z will be done by him also, pm me I can hook u up with the software and get u his info for tuning.