I finally got to the track since installing some Kooks lt's. Previously it went 12.9@108 with a 1.9 60ft in 65deg air. After headers it went 12.6@111 with a 1.9 60ft in 60deg air. The car is 3500 lbs with a 1/2 tank and me. A .3 tenth and 3 mph gain, I am pleased.