That's seems just a bit expensive. I found these
injectors at a store I use for only $849. Can't cost 4 grand to have them installed. I don't have any personal experience with these injectors but others are probably close in price.
2007 Dodge Ram 3500 Cummins SRW, Airlift airbags, Bilstein shocks, Smarty Jr., stainless turbo back exhaust, B&W Patriot 18K
2015 Grand Design Momentum 328M, disc brakes, Progressive Industries 50 amp EMS