All letter series and number series through the 450 are straight through, I have ones for the ABC, H, and M. The factory ones were straight through. I imagine the 460/560 are also, but I know nothing about those. As far as quiet, as compared to what? I drove an H as teenager. When I got off at lunch or at the end of the day my ears were numb. I am now at least 2/3rds deaf. Quieter than a straight pipe, definitely. Compared to the other current IH mufflers, about the same. But they have the very distinct, staccato sound that I remember from the 50's, which is the reason for buying them.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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