Trying to Eliminate Drone. Need Another Opinion.

MuuMuu101 said

I don't have any welding ability so no Helmholtz resonators (all the exhaust shops I talked to had no idea about what they were)

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You might search on those resonators, somewhere I saw a website how to calculate them. You could then print that out and take the info to a muffler shop?

You might want to build them in such a way that you can lengthen them/ shorten them a bit.

I don't know did the factory 340 cars have rear resonators?