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Borla Muffler

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There are a couple of threads floating around for exhaust. I am settling on Corsa Extremes for my Boss(thanks to Cloud9 and others), however, I am a HUGE Borla fan and have ATAK's on my GT500. They are awesome.
Ford Racing sells the Borlas under their own part number, right? Could someone give a cross reference as to which Borla is which Ford Racing part number?

Also, other than sound differences, has anyone actually measured the backpressure difference between the stock exhaust, Ford GT500 mufflers, and Borlas?

It seems to me that installing lower backpressure mufflers with the restrictor plates removed is just going to mean less exhaust out the sidepipes, with no real overall lowering in backpressure.
Even with baffles out, the crushed section of the side pipes gets pretty thin. There is going to be less restriction with the rear open, but it might not be enough for a noticeable difference.

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