| http://www.w3.org/ns/prov#value | - Aldoo, - technically the best thing is to cut off the cat, and weld a straight bit of pipe in its place, the same diameter as the pipes with no steps or bumps, if you leave the cat on even with the insides not in, you will lose velocity (flow/ power) but it would be better than having a full cat, though I can not remember if it was my idea, but you could build up a lot of heatwrap in a fat roll un
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