I have a LS stock w/AEM CAI and ITR exhaust. can't decide between 4-2-1 or 4-1 header and which manufacture should I go with for more power. possibly street legal and good price range. I plan to go LS / V-tech in the near future. can't decide about midrange power or top end. what's the diff. between race header and not?

 

a race header is mainly larger in diameter per design. if you want legal and something that works... get a dc header.