Thank you very much guys for your information and implication!
There are some interesting thoughts...
1. Dust shields...
Holger, I know you always said to ditch the dust shield and for performance you are 100% right!
a. As far as I know, it is impossible to take the dust shields off the car without taking the disc down (and the caliper). Although this is not a complicated operation I prefer not to take the calipers off the car 2 times per year.
b. The dust shield also provide a good base for mounting the air inlet. Without them I would need to create a bracket to fix the air inlet.
c. The problem with the dust/dirt. In the pictures above you can see the dust/dirt accumulated on the dust shield. Wouldn't it be a problem if all this dirt entered the caliper pistons?
I will look into these problems closely too see if there are simple solutions.
I want to buy a dust shield today to have the hub assembly complete and see if I can solve point a.
2. Buying a new brake assembly (like AP).
Unfortunately my finances are very low and the nqsbbk is very very close to being perfect for my car. Please remember I only have 160bhp and down Hungaroring straight I reach 170kph apposed to fuscobal's 210kph (I think). I abuse the brakes (aka braking like I should) for 7-8 laps at a time and, only after 3-4 rounds, the pedal gets softer. This is why I want to improve the brakes slightly and I do not expect miracles from the brake ducts. Dave, from what you said, I understand that any cooling is good and that I should expect at least some improvement. Did I understand correctly?
Also the nqsbbk fits behind 16 inch rims that no bbk does (for the mk5), relatively cheap discs, pads and maintenance. So, if I can improve the brake fade slightly there are no reasons to go for AP.
3. Having directional vanes or not...
some directional discs without ducting will work similarly to straight vane discs with ducting
This means that ducting is doing something good for the OEM 312 discs...
By the way Dave, did you create that 315x25 AP rotor for the nqsbbk kit?
4. These ducts with other BBK...
Am I correct into thinking that the brake ducts as described above are useful for any BBK (AP PRO 5000 for example)? The way I "designed" these brake ducts they will fit the 312 rotor but can be fitted to any other rotor larger than this.
So if I create these brake ducts I can change the BBK and not have to start from scratch...
5. For street/winter use I intend to "disable" the brake ducts. There are 2 ways:
a. put something over the brake duct intake (from the fog grille).
b. put something to block the air next to the hub.
I am not sure which way I will go but, I hope I can created a cover for point a. Please keep in mind that I want the solution to be nice and tidy and I want to make it flexible so that I can take it off/ put it on in less then 5 minutes.
P.S. About making something complicated, I have some time to kill... And I also find it very rewarding actually doing something by myself for the car and not buying parts.
Any more thoughts/suggestions are welcomed and, again, than you guys very much for your implication so far!