Quote Originally Posted by G.C
looks like your the one that needs to research more..

Wow that's news. They must of just started making those becuase over the years most people who have a greddy (which would be a better buy over the dc) or DC header would have an axhaust shop cut the collector and re-weld a 2.25 or 2.5" collector on to help with breathing when they do head work on the h22 to save money.
http://honda-tech.com/zerothread?id=218304

That's where I'm coming from. This dc header with a 2.5" collector is new.... (if you get it good luck with it but just keep in your mind whatever power you make you can make more a lot more.)

here is 18hp gained switching from dc to smsp
http://www.preludeonline.com/f60/h22...o-info-154398/

So I don't think I need to do any research because I already know that If I build a n/a h22 I'm not going to use a dc or megan or greddy or any other off the shelf header on my build becuase those header(s) are too restricted. Especially with the primaries, collector and there overall design. Well I guess not cause of collector sizes anymore since dc now offers a 2.5" collector that people have been doing for years.

Good luck with your build Bro!