Well IMHO DC whimped out and did no real R&D to improve the Viper engine. The peak HP was raised from 5,200 to 5,600 this is good for 25 or so HP, then the extra 17CI is good for 17HP, then a new intake is say good for 10HP add them up and you get 50 more HP. Whoopty freaken doo... obviously not...