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We made the same swap. Afraid of the police attention. They're not a whole lot quieter from the back, but the in-car resonance is much, much less. It's worth it IMO.
Switchin from the LM I's to the LM II's help, but with that O/R X, its still gonna be loud. Think about the O/R Prochamber. There is a clip of one with the LM II's that I created for the 4.6 section. Its a nice combo. You can find it under the tech and how to's sticky.