Your car has been downgraded, as it should have an L8 , but no this won't make any difference!

The TPS makes no difference what so ever, the L8 has double the memory though, so it can support things such as ALS,LC,CL etc.

They are just typical of any other FI car of the era, even when I drive run of the mill cars, I find they are more responsive.

Yes, I seem to remember the 4x4 flywheel is lighter than the 2WD though, something like 7-8KG from memory, for the 4x4, this will improve the throttle response, but on the downside it looses you torque!

Plus remember, the internals are forged and so have a fair old mass to them, opposed to whatever your other car is which most likely are light!

Also another aspect in the said compresion ratio, modern FI cars are higher compression, which will make them more responsive off boost.

Martin