I do have brake cooling ducting currently installed. I’m running 1521 carbotechs as a street pad and was never really thrilled with what I felt was low initial bite. Otherwise haven’t had an issue with them. I was thinking the larger GT500 brakes would get me some more initial grab on the street due to surface area without having to run a more aggressive pad.You can go a long way by just making sure you have brake ducts and a good set of pads..... I used pagid RS29 pads on the street and track with great results. Actually you can outbrake a lot of cars with that combo.... Only noticed a need for more braking then my OEM brembos with race pads, on tracks with more then 130mph straights and longer then 15min flat out.