Haven't heard of any V8 owners on the US www.audifans.com V8 list using the TAP chip, but a number of V8 users in the US have used a chip sold by Ned Ritchie from Intended Acceleration. So far the V8 list in the US has had favorable comments on the chip and the service. The advertised performance gains appear to be the same as the TAP chip.

The Intended Acceleration site is: http://www.intendedacceleration.com

Hope this helps

George