Walker mufflers are just a generic stock replacement muffler designed to fit many applications. If you brought a 340 car into a shop, they would put those same mufflers on. It doesn't matter what engine the car has as long as the muffler fits where the factory one was.
On my 318 Challenger, I'm adding dual exhaust. I'm going to have it look like the factory 340 system so I'm going with resonators too. I think the 318 dual exhaust systems from Accurate are just the 340 system with different head pipes to connect to the 318 manifolds.
The Walker mufflers will sound fine. If you don't want to run resonators, you may get some droning under part throttle cruise. That's all the resonators are designed to eliminate.
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because on a 318 it does not call for a resonator with these mufflers.
If a 318 would have been offered with dual exhaust, the factory would have used resonators. The only reason they didn't is because the single exhaust muffled the sound enough already.
