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I thought this might be a good place to ask this question, but I was under my 03 civic ex last weekend hunting down an exhaust leak. Found it, it was from the exhaust manifold to the (b-pipe), I replaced to donut gasket in there and no more exhaust leak. While I was under there I noticed from the exhaust manifold to the rear of the cat (b-pipe) the piping diameter is around 2". But out of the cat, the diameter drops down to like 1.5''. I have read many exhuast threads but none with a question like this, so what is the reasoning behind the bottleneck in my exhaust or did someone do a bad job matching up pipe diameters? It looks factory, therefore there must be a reason for it.
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