CarbonZTT is correct- the place is in Londonderry, not Portsmouth (about 45 min to 1 hr away). Paul Gasparola @ Avalon Racing is the guy you're looking for. Owns 2 very nice Z's and is one of the forum's sponsors. Look in classifieds for his phone number.
I had my ECU and intake installed by his shop and they did good work.
-John P
:His name is Paul and the shop is called Avalon. I think its in londenderry NH. BTW he does great work!