I'm not sure if this has been mentioned before but I just found that a software company whose other products I use has one called "Home Dyno".

I haven't tried it however the company is very reputable and I doubt they would offer something that wasn't what they said it was.

Anyway, if anyone is interested in taking a look you can find it at:

http://www.charm.net/~mchaney/homedyno/homedyno.htm

These folks also make Qimage if you want to look up their rep in that area (where I found them).

BTW - I have nothing to do with the company other than using Qimage.

 

The kit sounds interesting for those doing performance mods, and wanting to see the results. The only problem is that if you're not happy with the results, you still have to pay someone to tune the car.