Replacing exhaust housing.

[JimX]

I'm far from an expert on turbos, but of all the stats I've seen it seems that the turbine AR is generally bigger than the compressor AR. I can't see any AR numbers stamped on my exhaust housing, but it looks physically smaller than the compressor housing (see pic).

The compressor AR is 0.6, and the compressor blades are of those double fin type (I don't know what that's called, someone tell me?). Is there anything I should change on the turbo at all? I would like it to flow up to around 500hp.

If it's just the exhaust housing that needs doing, does anyone have a rough idea of cost including labour of the rebuild? Also some advice on who in Sydney can do this. I was thinking of ringing Garrett and asking them for a quote.

Edit: I can't attach the pic, but I've put it on my webspace here: http://members.optusnet.com.au/jimx/stuff/...jimx_turbo1.JPG