i have a DP that i got with no cat on it and i have straight pipe exhaust.

ive already spent a bundle on this and now i got so tired of the sound that i went back to stock. i was thinking the other day instead of selling out money for yet another system i could just buy a cat and have it welded in on the DP and get a magnaflow muffler and have it put on as well and i wont be so restricted like the stock system without that loud ass noise.

is this a feasible idea and where can i get a cat from to weld in anyone know?