2021 Mil-Spec M1-R Hummer H1 Restomod Packs 800-HP Turbo Diesel V8 16 Mar 2021, 15:40 UTC · by Headquartered in Auburn Hills close to Stellantis North America, Mil-Spec Automotive takes pride in its Hummer H1-based restomods. M1-R is the name of the company's latest upgrade package, which starts at $299,500, including the donor vehicle and a 500-hp V8. 20 photos The gargantuan turbo diesel produces 1,000 pound-feet (1,356 Nm) of torque in this application, but Mil-Spec Automotive can improve the output figures if you’re prepared to pony a few more bucks. 800 horsepower and 1,300 pound-feet (1,763 Nm) is the most you can expect from the heavy-duty engine connected to an Allison 1000 automatic transmission.