Its is going to be more then tough to shave a 1/2 second with bolt ons like a cold air and catback exhaust. As a matter of fact those 2 items may add 10hp at the most. The programer is going to pick up probably in the 60hp/100ftlbs range. That is where she will come alive. But even with that power, to shave off 1/2 in the quarter mile will be very difficult. This is my opinion, but I have some pretty decent experience with my GTR, previous CTSV and Z06.