Suspension and tires make a big difference to the speed which you dare reach. With skinny tires and stock springs and shocks, my 122S B20 is decidedly light and slippy at anything over 90, almost like aquaplaning. But I'm told that with lowered suspension you feel much more "hunkered down" and therefore don't chicken out so quickly.

I doubt that any unmodifed Amazon would get over 105 in ideal test conditions, but with mods, down a slight hill, with the wind behind, the world is your swedish oyster.

Trouble is in UK you just run out of road before you can do a proper test, and fall into the Irish Sea/ Atlantic/English Channel depending on where you happen to be driving!

Tom