Prelude 1897 I've been to NTPOG website years ago, didn't know you had a meet. Are locations & times listed on the website?

As far as DC Sports headers go, I wouldn't install one if it was free. As far as headers in general go, I don't believe you'll gain any significant hp unless you use it in conjunction with other modifications i.e. exhaust, cai, turbo or supercharger, ecu upgrades etc. If you just want to add a header, the only real difference I've been able to notice is the weight difference between aftermarket & stock due to the materials used. It would be a waste of money. Of course, I've never seen before and after dyno results. I could be wrong.