Custom Jobs ARE an option!!! Mr Lancer, I have to go on a mission so will be back in a couple of hours at the latest. I did not say 6 speed GSR, there are many ways of making the RS box hit 6 gears or an oversized 2nd to 5th that will get you over the 160 mark.
Have you seen the Silver RS III that Dave Brennun has??? He has a custom 5 speed box made by some Sangs in Aston
I took his car for a quick blitz the other day when he came down to have it fitted. The car was doing.................... up by Bill & Bull!!!!
He told me they offered him a 6 speed set up but he wanted to see how good they were by having this box for a year or so.
Forget what the local boys tell you about tried and tested. There was an Evo II RS in the Gumball around 6 years back called THE BIG RED ONE, it was clocked in the Netherlands doing 289KPH.
Food for though until I get back.
El