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  1. I have a WB Aluminum Pro pipe for an '03 450 EXC that won't fit on the stock exhaust flange. According to White Bros., the fix is to use a flange from an 250 EXC...... but that doesn't fit either, as the outer dimensions of the flange are the same as the manifold. Nobody has an answer, and I've got an expensive pipe I can't seem to use (returning is not an option, bought it a while ago). Any ideas?