To get an LS to 2.0L, you would need to bore it to 84mm, which would leave you with some pretty thin sleeves, so no, that wouldn;t go well with a turbo setup. If you want to do it the right way, then you need to get it resleeved to 84 or 84.5mm and the aftermarket sleeves will hold up to the rigors of turbocharging quite nicely. If you don't want to spend the money on sleeving, then pick up a B20b/z block and swap it in. It comes stock with one-piece 84mm sleeves that would hold up much better than an LS bored to 84mm.