I have just gotten a project cruiser that I would like to go the 4bt route with. Researching this option, there's a lot of people talking bad about how loud these engines would be and how much vibration there is. What is your opinion of the noise and vibration. Is it too much for a daily driver? I can handle normal diesel noise but don't want something too excessive. These look like the perfect engines for mileage, size, and power.