DIESEL CARE...THE PREMIER DIESEL SERVICE COMPANY SERVING MEMPHIS AND THE SOUTHEAST.Diesel Care and Performance Inc Toll Free 1-800-961-9290For questions or inquiries you can contact me at 901-380-9290For help with our products, find us on the web at http://www.dieselcare.us/helpfiles.htmlYou are looking on a set of high performance40, 75 or 100horsepower Powerstroke injector rebuild kits. Thesekits will add up to 100 horsepower to your existing engine, depending on which ones you order.We sell more fuel injection and performance componets that anyone in the market, and we consistently run our products for sale on eCRATER. We sell a host of products, not just a few select items and we stand behind everything we sell. We are there for you, our customers, on the internet and in the REAL world...our phone number is right there in our ad, and we are available at any time to handle your service related issues and questions. Get real quality service from your one source for all your diesel products, Diesel Care and Performance Inc. These nozzleswill work for all ford 7.3L applications 1994 to 2003. PLEASE NOTE ON YOUR ORDER WHICH HORSEPOWERKIT YOU DESIRE. These nozzles/rebuild kits come with the internal and external gaskets need to rebuild the injectors.We also provide an explodedbreakdowntoassist in the assembly of the injectors. FAQ's Q: Is there a price difference in the 40,75 or 100? Currently these are all priced the same Q: Can they be installed by a do-it-yourselfer? You would need basic mechanic skills to perform this task. Do not attempt if you are not confident in your abilty to complete this repair. Q: Is there a fuel modification needed? No other fuel modifications are needed. Q: Does this kit also include the installation O ring set? Yes it doesQ: I would like information on the hole size and flow rate, why don;t you publish this information on your listing? A lot of time and money was spent on the development of this product. This information is propriertary and we cannot publish it, other than to give you the horsepower increase.*We also have valve cover gaskets and wiring harnesses available to help with your installation.*We are proud to be a member of the Assocation of Diesel Specialist.