FUNNY! ask them how 4.10's don't mess up a pickup truck, or a late 60's cars that came with them from the factory, Or why ford makes them at all.
also for the pullies, tell them tose come stock on saleens that are covered by a FACTORY WARRANTY!!!!!
we had this argument at a dealer i knew, about a shifter, they had a stage 1 in thier show room, i asked him to have a seat in the car with me, I asked, "is this car covered under warranty?" Oc course he said yes. Then, I popped off the benzel and he about ****. There was a tri-ax handle right there and i asked him if he needed somone to take the rubber boot off to show him it was the same shifter i had