[oleyellar]

If you really want to get confused about header sizing and collectors and such, check out the New Dodge Neon Pro Stock cars at the drags. The new hemi motor, with the two center spark plugs real close together, have a wild looking header set up. It is a 4 into 2 , then dumps to what appears to be a really small collector. It sure makes you think, what is right. The 4 into 2 looks the same as the old Doug Thorley headers they used to make, then the small collector looks like 3 inch or so. Lots of engineering going on at Dodge.