I am in the process of installing a Halloway UN-1 upgrade and decided to add the Quaife ATB. I was under the impression that they were no longer available. Wrong. They are, however, no distributors for the QDF5M (V8 Esprit) in the USA. GTO Motorsports in the UK is the exclusive distrubutor for the QDF5M. Price with shipping to USA $1,270.50.