I am running the ebay header, and aside from the crappy flex pipe(which I had replaced) I am very happy with it.
there is a dyno on acurazine on it and it does make power according to that one, I sadly haven´t got a befor and after dyno on the header to confirm that

I have also got the K&N typhoon cai and am very happy with that(nice growly sound at wot)
and the Hondata reflash, that of course is my favorite mod to date

210crank hp and 247.5NM (around 30whp@6000rpm gain)

in a couple of weeks I´ll have ep3 CTR 1-5th gear and final drive+flywheel. and cause of our crappy stock gearing I am betting that will become my favorite mod