ecotec

i have a friend that's trying to get 50hp out of his 05 cavy with a turbo (his first mod, wouldn't even listen to me about I/H/E)......well he's getting this $1500 turbo that's supposed to add something like 30-40hp but i think there are cheaper turbos that can do better than that. My question is which ecotec came as an option with the 03 and up saab 9-3's and is there any difference between the heads of it and the l61.....also does anybody know how much both the high output and te low pressure turbo that came with the 9-3 are boosting + the 05 cavy ecotec's compression ratio?

please and thank you