+100 you are in for more headaches than it's worth. the "d-tech" or Opel ecotec is actually a more powerful motor it just gets a bad rap here in the States.
take the 2.0 aluminum ecotec with turbo/SC as in the the cobalt or whatever, it only puts out 173.
the factory turbo version of these motor hits around 200hp and there are four different version that all get different HP numbers.
Kinky and I have been at the forfront of performance here in the states when it comes to these chassis and motors, you just have to visit our sites to see what is available.
there is also a member here pushing over 230hp with 100% stock motor with a turbo kit.
there are aftermarket cast turbo manifolds and OE cast manifolds as well as the stainless header flanges i sell for custom turbo headers.
what i would do you you place is set a budget and set a desired HP range and Kinky or I could help you out.
My site, www.daftart.com
, is focused on engine and some transmission and Kinky, Kinkymotorsports.com
, pretty much covers everything else including a really nice aftermarket cast T3 manifold.
also like Kinky said, if you are wanting a to do a swap I have basically a 2.0 motor stroked to 2.2 with just about everything you can do to a bottom end and I'm practiaclly giving it away.