I have a DC sports 4-2-1 ceramic coated header... It's an OK piece of equipment, but nothing to really write home about, and will be replaced with either a nicer header or a turbo manifold in the future...

I got the header mainly to get rid of the exhaust buzz that plagued many GS-Rs...

It's a good header, but it's far from the best... IMO it's worth the money (Excellent bang-for-the-buck value) with a simple and easy install, but it's not worth it if you want maximum power...