The GT 5.4L is not a modified Triton, it is a completely new engine that remains in the MOD family so it shares the same bore & stroke as the conventional 5.4L Triton... Aside from that the engine is completely different all the way down to the oil passages within the aluminum block.
The SRT-10 weighs roughly 5200lbs w/ 500bhp & 525ft-lbs, tests currently put it running 13.89sec in 1/4 mile.
The current Lighting weights 4650lbs w/ 380bhp & 450ft-lbs, and has consistantly ran 13.80's in many magazine tests.
Dodge doesn't have an official tow rating for the SRT-10 either, infact they recommend not towing with it. The Lighting has a 1350lb payload capacity and a 5000lb towing capacity making it a usable truck, not just a psuedo sports car with a 6ft bed...
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