Hello Seth I have had five 911 Turbos 87,91,96 and two 01 996 TTurbos's. Back in 1988 when I took delivery of my first turbo with a few mods I was running about 350 h.p. that made me one of the fastest cars on the road. When I took delivery of my 91 Turbo with one modification I was running about 400 h.p. I ran 12.7 e.t. @ 117 m.p.h. with a 2.20 60 ft time, the only thing on the road that could keep up with me was a motorcycle. The point I am trying to make is back in 1988 Corvette's were putting out about 245 h.p. or maybe a little more. That gave me about 100 extra h.p. over the Vette, the same in 91 I had 100 h.p. plus over over the 91 Vette. Not so in 1996 when the 400 h.p. 996 TTurbo came out every sports car was putting out more h.p., the Vette, Mustang and all the after market tuners Saleen, Linginfelter, Hennesey and many others were avalible making more h.p. was easy. Suddenly the the Porsche turbo's didn't have the h.p. advantage over the competition, especially Viper's with 450 h.p. and 500 t.q the playing field was level with Porsche falling behind with only 400 h.p..
Seth your 12.38 e.t @ 117 m.p.h. is decieving, thats a great e.t. at the track but on the street thats a totally different story. Try a 10 m.p.h rolling start the Viper will have at least two car lenghts on the TTurbo by the time you hit second gear. Try 60, 80,100 m.p.h. rolling start it will be worst, the Viper has to much immediate torque on the bottom end where the TTurbo doesn't.
With all the Tuners out there the Viper blows the doors of the TTurbo, go drive one and you will see. The Viper may be a little awkward at first but beleive me you get used to it.
---------------
01 GTS 10.90 e.t. @ 131 m.p.h.
02 360 Modena
01 TTurbo Porsche
01 BMW M3
01 BMW 740i sport
02 Escalade 22" wheels, dual flow masters