[99LeCouch]

I bought it off a guy who did it for a project. You can roll your own with time, patience and a Dremel.

I'll have some A-B data later this fall when it's my turn to drive in the 140-mile roundtrip carpool I'm doing with a classmate. Of course, the car is also getting a pretty major going-over before the B testing, so that will pollute the data.