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And I was wondering what gains, if any, as far as mpg goes from cutting off my muffler. The exhaust already ends right after the muffler, and I know it will be louder, of which I don't care, but I was wondering if there would be a noticeable increase in mileage. And how would it affect my EGT's?
It doesn't hurt to help the IDI breath both in and out. Cut out the soup-bowl and that restrictive muffler are two simple and inexpensive ways, but the gains are small. I like to replace the muffler with a glass pack and it's hardly noticeable above the natural noise of the diesel engine. In fact, the only time you can really tell I'm running a glass pack is when I downshift to decelerate.
I honestly couldn't care about my neighbors and being to loud, I'm not starting a snowmobile at all hours of the night when we have no snow. I got a new job that's about 35 miles away and just trying to save as much as possible. And hopefully it warms up soon and I can get a pump and injectors and put them in.