I have no definate prices, but I think you'd need at around £1500, but it depends what you go for. From what I have read on Glub GTI's forum, I should be able to get around 200 BHP by converting to these.
Joby, I had a little go a a Civic Type R too, and was suprised how well my Corrado did against it.
Mistrall, when I had my car on the rolling road, it was £30 if I remember correctly, but that was part of a group booking through the forum.
There are lots of tuners around the country who would put it on their rollers for you. It depends on your spec tuning wise, mine is all set up to standard factory settings.
Quality, cheers dude :wink: