Hello from Brisbane.
For about the same amount of dosh being bandied about you can get a Startrex unit from the crowd in Canada who make the Roamerdrives. These are supposedly more powerful and efficient than the originals and bolt straight on.
British Off-road on the Sunshine Coast were selling them at one stage. Presumably anyone selling the Roamerdrives is too. I have one for my S3 88" but have yet to fit it.
Cheers,
Neil

