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It has an angled exhaust housing??? Weird. A 13G should not have an angled. If you can get at it with the heat shields off, you should be able to see what kind it is, I think the plate is on top.
But weren't the angled flanges 3"? Could the angled on the T5's be angled 3"? Do the exhausts have like a 3" opening but then drop to 2.5" or something?