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Can simply adding the glasspack type mufflers behind the Flowmasters really quiet it down that much? I am alright with trying simply adding the glasspacks but I am wondering if I am not happy and then have to take it in again to swap the Flowmasters out, if I should just do everything at once?

Just me I'd cut the tailpipes alongside the rear leafs & add the glasspacks which you could easily do with some hangers & you'd be up & running in no time with no labor charges & you'd quickly know if that is going to take care of things

live every 24 hour block of time like it's your last day on earth