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Which free-flow 3 inch middle muffler \ resonator?

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Which free-flow 3 inch middle muffler \ resonator?
I got 3 inch downpipe with race cat, than straight pipe than 3 inch free-flow back HKS muffler. That kind of setup sounds very nice and loud. But I do not like idle sound especially with AC on. That is very annoying in traffic jams. Also it does make some kind of resonance while accelerate with 50% throttle between 2 and 4. I want to make it quieter but I do not want any backpressure or higher EGT. So which high quality middle muffler shall I get? Most known brands got info and description about back mufflers but nothing about middle one. And will 1 middle muffler be enough? Or shall go for 2?
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mhess427
Maybe something like this magnaflow would be nice for you.


I'm about to add my catback with only one small borla muffler, if it's too loud and obnoxious I'm gonna get one of those resonators myself.

BTW can someone explain the difference between a muffler and a res? I'm sure I can google it, but why would one want to have a res in the middle instead of a second muffler?
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