I see we have some kits on the market.
Three of them are =>
M-tuned which was the one you bought unless you went the diy-way. Price about 330 usd.
Qmax as 949racing are promoting these days, big orange and good looking and better priced to about 250 usd.
IL motorsport's kit which only come the NA6 at the moment. Priced to about 250 usd (at the ilmotorsport.de web-shop)
Never installed one of these, but changed coolant hoses "back there" I'm cringing at the thought of installing the Qmax kit without removing the head or loosening the driveline.
Personally I like design of the IL kit best. Looks like a good solution and easier to mount than the others.
(Not that I think anything are easy doing "back there".)
The IL kit does only come for the NA6.
Asking about a NA8 version I got the following answer :
"I can't tell you an exact date now, too. But the date gets clearer. We expect to be able to offer it at the end of September/ beginning of October."
\\Stian