Which parts from RA are the stock mufflers? I see this

AP EXHAUST Part # 700300 DIRECT FIT MSL/MAXIMUM Muffler; Direct Fit
Left; Dual Exhaust

AP EXHAUST Part # 700298 DIRECT FIT MSL/MAXIMUM Muffler; Direct Fit
Right; Dual Exhaust

or this

AP EXHAUST Part # 700293 DIRECT FIT MSL/MAXIMUM Muffler; Direct Fit
Front Muffler-; Dual Exhaust
Front Muffler-; Single Exhaust;OE system was a welded assembly. It is recommended that all parts noted [1] on INFO page should be replaced.