"Top of the Line" injectors, like DD, yes, you're in the right price range. Don't forget, you can get Bosch 275's for less than 3 clams. Those seeking only max power seem to prefer the DD's; those seeking "some" power and a little improvement in mpg seem happier with 275's. The Bosch 275's are equal to your original injectors in overall quality; made by the same folks, and made specifically for the 275 hp Cummins as used in RV's.