We offer free tuning updates to our direct customers when upgrades are purchased directly from us. Shipping of injectors are directly from Full Force Diesel. For shipping next day or express please call us for desired shipping availability. *A return label for your cores is supplied for your convenience. Proper return packaging is supplied to you by Full Force Diesel to return cores back to them. If you choose to not do a core fee you shall be responsible for any damage done to the cores during shipping. In the event there is damage to the cores during shipping you shall pay all additional fees for replacement parts. Your order will not ship until FFD receives your cores. All core fees are refunded to the credit you used when placing your order. Your refund takes up to 3-4 weeks to receive after Full Force Diesel receives your cores. **The 18 month injector replacement warranty is offered through Full Force Diesel. Please contact Full Force in the event a warranty injectors(s) needs to be sent. This is a replacement warranty ONLY. Core(s) MUST be returned or the Warranty injector core fee will not be refunded. Please do not contact DP-Tuner for warranty injectors to be sent. *For All International orders cores MUST be received by Full Force Diesel and inspected before orders can be shipped. When shipping cores back please indicate on your label the following notation, "Return to sender if undeliverable". This is crucial if the cores get misplaced.