[J.j.]

No problem Faustnik. The power to weight ratio for the Bf109Fs-Gs compared to their trop versions were identical, since the trop filter and desert survival kit added a trivial amount of weight to the plane. Unlike the British trop modifications which changed the drag profile of the aircraft and hence it's performance, the trop versions of the 109 performed exactly the same as the non-trop variants.

I've read that Tropical versions of Bf 109 have a 5% decrease of speed with sand filters.
(according to german tests)
For comparing, Hurricane Trop versions have 8% speed decrease.
I don't know for Spits, but for sure they have also a speed decrease.

It's non blue or red whining, I just wanted if possible to have Tropical versions of both sides aircrafts, with performances decreases.