Originally posted by Krusty
SpitV is already porked with +16 boost 
It's probably FASTER than the clipped wing version was. In AH2 at any rate, SpitV/IX are almost identical in top speed on the deck (and that's the only place the clipped wing would fly -- the clipped wing suffered at even mid alts and was kept to mid-to-low alts)
Not really porked, we just got the Spit V with the maximum boost allowed.
Makes up for the worst Spit IX ever made that we have.
Have to distinguish between two things -
1) Lots of Mk's got clipped wings to improve roll rate.
2) That doesn't mean mid alt suffered, depended on whether the engine was an LF or not. E.g. a clipped wing LF would be better low alts.
Dan can explain it better.
I know there were 3 basic engine variants LF, standard and HF, each suitable for different altitude bands. This was irrespective of clipped wings.