Well, I drove the car back to back with the saleen grille and the stock grille with fogs in. Honestly, it felt the same to me. I blipped the throttle under several rpm ranges and gears, and both were pretty consistent. That helps me with my decision to keep my fogs.
As far are temps are concerned, I don't know. But I can't see it being too much different, since it's still pulling in the same ambient air.
As far are temps are concerned, I don't know. But I can't see it being too much different, since it's still pulling in the same ambient air.