I could probably get a feel's header for £500 - £600 myself , however you dont find much info on them. Sure a lot of guys say that they like them, but i like hard proven numbers.
I would buy the hytech but there are ground clearance issues ( i have a mk2 crx )
I dont really mind paying 5-7 hundred, but £900 is a piss take.
When your trying to build one of the most powerful b16's in the country on a budget.... ....