The whole point of modding a single cam motor is because it's inexpensive. Throwing on a $300 DC Sports header is quite useless and defeats the whole purpose of the SOHC.

If I were to get anything aftermarket, then I'd get something cheap such as Chikara. It won't last long but what'd you expect? It's not like the DC Sports header gives you neck snapping power anyways. The Chikara will save you money.

You can also use a 96-00 EX factory exhaust manifold since it is slightly larger than all the USDM 92-95 ones. It's also cheap, if not free. I'm not saying it does much but neither does an aftermarket one.

^ Strictly speaking of lightly modded single cams, Bisimoto's car doesn't count.