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Re: mufflers for 5.3 with headers
true duals tend to snap and crackle when you let off the throttle quickly, h and x pipe fix some of that. an h pipe will sound smoother than an x since its more an expansion device than a flow director. allowing that expansion with an x or h does help efficiency too.
I like smithys glass packs but again, its probably a bit subjective. my 283 had cheap old red autozone glass packs and true duals. you want them close to the headers because the further back you put them the longer the standing wave and the more drone you get.
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