Last year I took My 1999 F-350 with 186k on it’s 7.3 Power Stroke Diesel in to Bills Garage in Taylor MI. It took until April to get a Jasper engine and until Almost July to finally get it done. The replacement is knocking louder and has less power and performance than the engine that had a slight knock when removed. After two returns to the original garage (300 miles each way) it’s at Hillman Tire in Hillman MI now... and I’m still without a truck! So I DONT KNOW if they are worth a crap? I do know they need to monitor installs a *** of a lot better!