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The real trick is the RB muffler section. I've run FBs with no muffler, with fart can and then with the RB and the RB def does an excellent job of quieting down the exhaust. The same car had road race headers and an old-school RB presilencer from back in the 80s.
One320fc already has the SP 12A RB headers, so really it just needs the RB catback and highflo cat (we have visual inspections here in VA)...
Go w/ your original plan man... get the RP catback and universal hi-flo and get it all welded it up.. its the cheapest and probably best performance/sound quality you're going to get.
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