Installing my new cat tommorow
My current one is shot to shit, horrible rattling sounds and stench
Will it make a difference? otherthen the sound and smell?

should make a difference

Is it a brand new High-Flow or a Stock replacement one?

Its not the highflow, cant do the welding in my driveway heh
Just regular bolt on

None of the high-flow ones are bolt-ons?

no not at the local lordco :(
none are boltons, stragnely