4.2 Tyres on Speed Six ??

[phockit]

I'm going to be up for a new set of rear tyres on my speed six soon and am wondering if it's worth replacing the existing standard 225/50's with 245/45's as used on the 4.2's (as I believe they share the same wheels).

Anyone got any views/experience on the difference, if any, this will make ?? I'm not sure why they are different in the first place as bhp and torque are near identical on the two models.

[phockit]

I thought the higher profile tyres were meant to provide the softening of the ride and that these and a couple of cylinders were the only difference between 4.0 and 4.2.