iv'e been using vauxhall forums like migweb for the last few years and the biggest name for a turbo kit was this guy. mvaux.com . he mainly deals in vauxhall but can supply a turbo kit for any other make or model. only problem is he needs a car to develop it on and he's based in brazil, which he tells me is quite hard to find 2.0 gen 1 coupe/tiburon out there. so he needs

"a sample turbo manifold with correct measures, we can develope one here, and then, make the whole turbo kit"

"The prices will be very similar of Vauxhall turbo kits with tubular manifolds, around 700GBP"

if you want any info on his kits go on his site mvaux.com

so if anyones interested and/or think you can help out with what he needs to produce the kit, it would be much appreciated.
this isn't just for the gen1,he can produce kit for any others, if you can do the above.
i'll try find the post on mig with the feedback off people who bought a kit to reasure people of his work.