I think you'll find that I replaced the N75 valve Rich. I usually change that as a matter of course if it's elderly or even the original one, and I'm sure that I did the S4's.
And I did the 710N diverter valve too, as well as the bloodly MFTS, ecu temp sender and a nice set of Samco boost hoses. They'll all be listed in the receipts if you've kept them.
Get the timing properly checked as it may have been upset when the head was changed.
Also a pressure test will show if you have a boost leak from say the intercooler or a gasket somewhere (won't be the hoses!).
You may find that the coil packs are past they're best by now, I know that you had a couple of them changed but they usually last 100k or so. Get the POS checked too.....
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