Need new muffler for 318, looking for quiet, what are my options?

67CBodyGuy said

Yes.

If I keep it single, should I at least have a 2.5 pipe instead of 2.25 ?

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2.5 would help the engine breath a bit more up high in the RPMS. I think the walker Quiet flow is a good choice. Yon can also add a glass pack if you have a long straight area in the exhaust, usually near the exhaust tip is a good location.