Derry, the 6A13 (n/a) engine's gearbox is a direct fit to the 6A13TT engine, so that's a simple solution. The grip is a problem when you need to get away fast from standstill. My VR2 (stock boost) does 0-100km/h in 6.2 sec, which is not bad at all, but should the full potential of the power be used, then I agree: 5 sec's should be very possible.