So my 02 Yukon Denali 6.0 U engine was bogging down when accelerating. Eng lite on and mechanic saids that the right catalytic converter was plugged. I drove drove it on high way at about 80 mph and I could here a loud like back firing sound. The light eng light went off and now truck running normal. He told me it may have cleared the cat out when I pushed it on high way. But if this starts again any advise on where i can order this right side cat gm part # 10395213. Looking for aftermarket deal, but wondering if anyone has changed these. Thanks.