So I'm replacing my header cause It's making my car slow ass all hell.. ran a 14.7 back when it was only alittle busted up on the bottom. now i got kick ass tires ( lowered 60ft allmost 2 tenths ) pressure reg and busted up my header some more and now can only manage 14.9's with that kick ass 60ft... so I'm blaming it all on the header. don'y really want another dc so i was looking at the greddy's, I beleive the greddy's have larger primaries then the dc. can anyone give me any details on the greddy peice?