I have just installed the DCP Gen IV heads and intake. Great product, they were received in a timely manner in flawless condition. Very nice work. A few questions during install, and the DCP tech support was as expected...great. I have over 5000 track miles on the car, and the power is definately improved....SWEET! I can't wait to get the car out on the track and see the improvement in MPH and lap times. Thanks Dan.