the app cost $8 but does things like monitors mpg, engine knok, coolant temp what ever the honda sensors pickup which is a lot of info. I don't know how to even load a app to a smart phone. Right now I am trying to port my phone number to the smart phone and it hasn't worked so far, I am pissed off, I might just have to keep both phone numbers. after a while this tech stuff simply isn't worth bothering with. I did get rid of the rev hang with the non carb reflash- a major improvement over the stock tune-I am eating a little more gas now, but the cold weather might be a factor. I will be getting 10% off my insurance because of the two aaa driving courses I took and it did make me a better driver, enough so I actually noticed. You turn the app on the phone is all you need to do to read the engine with the Hondata connected to the car which is another pain in but with that wire connector hanging by your legs. I think you can run the wire over the steering wheel or simply run the Hondata to back seat floor

and It might not interfere with driving?