I have full set of of DDP 100% over injectors for sale. According to DDP's site, they use Electro Discharge Machining done by Bosch is followed by Abrasive Flow Machining, to clean up any imperfections, remove burn residual and balance injector flow within 1 liter per minute. There are less than 1000 miles on these injectors and were recently tested for good measure and tested excellent at St. Joseph Diesel. These injectors on DDP's site are $3750. Will sell for $2500 shipped to anywhere in the lower 48. No Cores Needed. Paypal is preferred but can accept cash or credit card, buyer pays convenience fees. Bret 608-606-0900 If you have any questions, please call and i will be happy to talk with you. NO TEXTS.