I only know of places in NH. They will install your parts, but they usually jack up the hourly rate a bit because they aren't making money off the parts. If you're willing to come north of the border check out these places.
Holt's Autosport
1 Columbia Cir
Merrimack, NH 03054
603-423-0007
We get our 95 GL serviced here. They do good wook.
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Martel Racing
232 S Main St.
Manchester, NH 03102
603-622-9747
They've installed the Borla on the SVT and Cougar.
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Concord Lincoln Mercury
158 Manchester St.
Concord, NH 03301
603-224-4100
We had a bad expeirence with them once, but the a$$ hat service manager is gone so all is good again. Talk with Lee in service and he'll take care of you. Also ask to have Mike do the work. They installed the Bat struts and Eibach springs in the SVT and Cougar.