regals and GN's have almost completely different options. cts and a cts-v are the same car because they came with the SAME options. you mean to tell me a tahoe = yukon? i will inform GM...
you're correct in saying the fastest FACTORY gn had 235hp but that means about as much as a velvet painting of a whale and dolphin getting it on. GN's and T-types had and still have very little trouble getting into sub-12 second 1/4's, and still get decent gas mileage. cant say that for a maverick...
EDIT: ask any GN owner (not t-type) if they have a regal, and they will tell you no