If the price is 15K that's about right but for about that you could put a Cummings 6bt P-pump using the 343 tranny and change your final drive . The milage and power are worth it and you saved a bunch of money . I bought a Cummins 6bt for 1900 had the head redone $300 +gaskets a adapter is $5100 comes with intercooler hoses and torque converter. I think being a purists is nice but I want my FJ 80 to be greatly improved in HP and milage . I also spent $200 on Powder coating because I want color in my engine bay . Good luck with the idea I hope you sell these but I'm seeing more of a PITA than a hot selling product