Hi
As the other guys say NOS is the cheapest way to give you loads more power. It is legal but your insurance company won't be keen (if you tell them of course :winky: ). NOS wizard kits are well respected and cost around the £500 mark. However, these kits can be found on e-bay a little cheaper (around the £300 - £400 mark). Here is the link for NOS Wizards site. http://www.noswizard.com.
Cheers
rastz9