I have the Borla 4-1 header and am very happy with it.
The key advice for PT headers (besides Beware of Hedman) is to REINSTALL the HEAT SHIELD.
Without the heat shield you run a real risk of cooking the computer... which is a very expensive Bad Thing.
Make sure the installer has the skills and materials to fabricate new mountings for the heat shield... paying a couple of hours extra labor on the install will save you big bucks later.
Good luck
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