i have the VQ30DE-K engine. i need a new CAT ... i was hoping it wouldn't be that expensive if i bought it and had a friend of the family weild it in. although the part itself is 160+ online! i was hoping someone would inform me that i could just buy a universal CAT with the right dia. to fit my exhaust but that sounds to easy nad im pretty sure this is a 2.5 in dia ?

thanks for your time !

 

any ideas !