No BS here. We are working with a company, Clean Cams Technology Systems http://www.cctskit.com/ who offer a kit to bring mechanical 2-stroke Detroit Diesels into not just EPA requirements but CARB requirements. I recently built an engine using their kit. We are gearing up to do the second. The concept behind the kit is simple, they grind all the lift off the cams and use a turbo (which is a much more efficient compressor) to restore the power of the engine. One of the most beneficial side effects of this setup is that the engines are much quieter. They are also supposed to match modern 4-stroke engines such as the John Deere 6081 for fuel efficiency. The kit isn’t cheap. I think we paid about 7 grand for it. It includes a turbo, liners, injectors, cam, and pistons. You have to supply the rest of the overhaul parts. We ended up having to oversize our block so our costs were high. The entire overhaul including installation in the boat was 14k. But the only other engine manufacturer that met our PTO needs was Cat and 14 grand for a 35k hour 1200 rpm Detroit was a much better deal than paying 25k for an equivalent powered Cat that had an advertized life of 25k hours. There would have also been significantly higher installation costs because we would be installing a completely different engine.