i have a 91 RRC with 189K miles. i had the following done a couple months ago.
-new OEM LR muffler bought off the internet
-was installed by local muffler repair shop and since it was OEM, it went in easily
-new pipe from muffler back to bumper; threw away the resonator can just before the bumper and havent noticed any difference
-replaced the rubber seals that are used to connect the R and L exhaust manifolds to the R and L sides of the Y-pipe/Cat assembly. Doing this eliminated the rich-gasoline exhaust smell I was getting on startup and significantly quieted the engine noise. those rubber fittings were basically gone so it sounded like rattling every time i gave it gas.
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Pat Herman
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