Horsepower this horsepower that--dyno this dyno that--The real skinny is the DC SPort 4-2-1 is an overall good header,better suited for a short twisty track,OPM's 4-1 or a simular header is about 2-3 car length's faster on the medium to long tracks.You really will not notice any difference until you get on the straight's.One thing to consider is that if you like to leave the cement alot--the 4-1 does' not fit under the car as well.The 4-2-1 fits much tighter to the oil pan with a little more ground clearance.

AND---you have to do a few more things to the car to gain any of the power from that header($450)--about $300 for the DC Sport) which is a upgraded ECU,new final drive,etc.
The only way to keep up with the fast Honda's is do everything to the car that you can and drive that MoFo like you "stolt it".

D.V.
former CRX'er--currant SM driver