We've used the 4-2-1 DC header before - it's a good header. Three years ago we tried a 4-1 header done by Walt Puckett at Delta Group Motorsports. We've ran it on the dyno and have been running this unit on the track since then on two different ITA CRXs. I highly recommend it. Quite a few other Honda IT racers use this header. It is great for top end (especially after 6K) and that's exactly what is needed to make the d16 fast on long straights. Get this header from www.opmautosports.com or from Walt Puckett at (704) 434-8046. Good luck.

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Alex
#2 ita