I run a Pacesetter header on my E16 and I like it. It is not of the best quality, but I have upgraded the header to suit my needs. The port match wasn't perfect, so I made a couple of cuts up on the flange to separate the headpipes, bolted it to an extra head and lined up the ports correctly. Then I mig welded the flange back together and port matched the tubes to my cylinder head's exhaust ports with a die grinder. After putting it on the car, and racing with it for a few seasons, the pipes began to crack from the flexing of the engine back and forth. I already had a flex joint added to my front pipe and the Nismo engine mounts so that wasn't the problem. I simply looked at the pictures of more expensive, better built, headers for Hondas and such. They have an extra bracket in the rear at the collector, that bolts to the rear engine mount. I duplicated that for mine, and never had another problem. You could probably use the Pacesetter header with out all of that, but just be sure to add a flexible section to your front exhaust pipe to allow the engine to move around and not crack your header.
