So here is dumb idea that might just happen.
The exhaust is rattling bad, probably rust is causing it(I’ll throw it on jack stands later today to see how bad it is.) Since I’m cheap & do dumb things it could work. I would go full stainless steel, but since that’s expensive. I do a side dump to reduce material costs, & it also look incredible. Maybe downpipe back, the 2nd O2 sensor is after the 1st cat so removing the 2nd cat would not throw any codes. Stupid & cost effective.