Thanks guys for the comments,

Yep for now I've got all 3 at home - not for long though...

Currently I think my favourite ride is still the Legacy, it's the fastest of the lot and still a really smooth and not too loud system for something that has ran 260K. The WRX was a good deal so was hard to pass up and is new fun - handles like a dream.

I gave it an upper engine cleaner session tonight and took it for a run - it's getting smoother and feels like it's almost there. So I wanna take off the IACV and clean it out good but 1 screw was rounded off.. too hard basket for a late evening job. I also noticed there is a one way value on the factory boost controller - likely to be there to stop boost cut - I know that on my Legacy when I had that the revs were a little jerky too. So I may take that off too and give it a try.

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- 2009 Subaru Impreza WRX STI Spec R Hatch