This argument about headers is retarded. Matt's car is fast because he's made 50+ passes in it at the track. I saw it when it was going mid to low 8's and he didn't change much of anything to get it into the 7's other than driving. It wasn't a set of headers or any other parts that did that for him.
Having a pile of parts on your car (or on the floor) or having big dyno numbers is no guarantee of going fast. I took my V from 8.1 to 7.68 with tires, between round cooling and launch technique.
It's easy to get false confidence by buying parts, but realize that the track is a reality check. Buying the parts is about 1/4 of the battle. Putting them on is another 1/4. Tuning and making it run the numbers is the other 1/2.