4,248. Location. Phoenix, AZ. It's more than a pulley swap. You MUST do the tuning to take advantage of it and keep the car from burning down. Maybe the reason the Jag pulley only gives a 1.5 psi boost change is because they can't tune the car and that amount is safe without it. Sep 24, 2006. #5. This Jaguar S-Type R is the second year of the superb 400 Horsepower 4.2 V8 mated to a 6 speed ZF transmission which gives more power and better MPG than the previous, also superb 4.0 V8. Shop Jaguar S-Type vehicles for sale at Cars.com. Research, compare, and save listings, or contact sellers directly from 39 S-Type models nationwide. Engine: 4.2L V-8 DOHC, supercharger zSKAa.