At work I noticed this turbo that has been abandoned and I just wanted to know if something of its size is suiteable for an A12 or 15. It's a mitsubishi TC06-11, I think it's from a sigma turbo

A tc06 is a very old design Turbo .. For better boost response your better off with something a bit more modern .. some of the smaller std nissan and subaru 4cylinder turbos would be a better starting point long term .

TC06 is an awful turbo.

go for the TF035HM off the subi forester GT, everyone is giving them away as they swap up to a TD04.

head over to the GTRYDAZ forums or the MRT forums.

cheap as chips - i had a pair delivered with less than 15thou on them for under $300 canberra to WA.

for a draw through set up id go with a t25 of a silvia sr20 or ca18
try gettiing a one that has stuffed seals so that u can rebuild it with carbon seals so that it will last longer as any turbo with fuel getting drawn through it wont last as fuel eats the oil seals then u loose oil and motor will blow,