When I say ar60 I am talking compressor housing, this is std on the 4x4 sierra, 2wd had ar.42.
This would still give low down boost with lots of scope for more power, it won't give a big kick like a .63 turbine housing would, because it doesn't have the lag a .63 does to start with so there is less difference between on boost power and off boost power as it is there to start with.
A new .60 ar compressor housing fitted is around £200, I use turbocentre 01924 404112.
tabetha
tabetha