boosted3g

I am thinking of upgrading to a larger turbo for my DRAG kit but i would like to keep the manifold. Will a 60-1 fit without any modifications or is the exhaust flange too large? I currently have a T04E .63 with a stage 3 exhaust wheel. All this is on a LS runnng 20 psi with a ported head, ported manifold and large cams. Also everything is matched and the engine flows really well. I would llike to see 10s by the end of the year.