Originally Posted by Florida
A 4-1 header is for more power in higher RPM's;
A 4-2-1 header is for more power in lower/mid range RPM's.
Which side of the band you want to be on is your preferance.
this is TOTAL bs...there are too many header makers out there that make 4-2-1 headers that create power from 2k on... anyhow, no dc is probably the crappiest header maker, you want a header like a rage motorsports header...go to kteller.com they sell this header as well as the exhaust piping, flanges and all of that good stuff that you need in order to let this motor flow like it needs to... get 2.5 inch exhaust straight through.