My 32 behaves pretty much different under some temp conditions.
High temp gives me much poorer performance.
I live in Santiago and temp. ranges about 40ºF even during a day.
Should it be an intercooling issue or some?
Should it be a little bit more efficient or so?

In my research (which a few people have disagreed with), it's not an intercooling issue. A supercharged car sucks in the same volume of air, and on a cold and dry day, that volume of air is more dense with O2, therefore more power making potential. Air pressure, humidity, all have something to do with the power your car is making. In fact, on Kenny's SLK 32, it made the fastest drag strip run (ET and mph) on a 24C evening (3 back to back runs without cooldown). He's run slower on 16C nights.

We used to go drag racing every friday night so we can see the difference pressure and humidity makes.

I think you are all right, but the fact is that I do not have any other 32 here to compare with. Some 230 only.
I used to drag very even against some M3, 911, RS4, HKS Evolution VI and some high power WRX with overboost , all of us around 12,9/ 12,8s on 1/4, but that´s all.
I felt my 32 the most affected by temp no doubt about that.
Neverthless it is a amazing car anyway.
It would be my second , third , fouth ...car indeed.

As the intake air get hotter the chance for detonation get greater, so you might be seeing the ECU back of the timming a bit also, 40c is HOT.

NP

True, but I've never seen timing numbers get pulled back on a stock 32. Then again, I've never seen 40C weather here (Canada)... worse I've seen with OBDII scanner was around 30C and timing was not pulled back at all, stayed in the low-mid 20's, same timing #'s as -25C .