i have a major issue and i would appreciate some help. i have a 2005 grand prix GTP with a 110,000 miles on it. a few months back i took it to my local shop because i started hearing a loud knocking noise under my leg when i drive and hit bumps on the road. the mechanic told me that the catalytic converter is falling apart and needs to be replaced. i did my research and found out about the zzp dp while i was looking for a cheap aftermarket cat. i looked in ebay and found the ALL STAR catalytic converter for about $126 and i also found the zzp castles dp for about $136. i'm not sure which one i should get. i heard that the zzp can enhance the car's performance.
did anyone got the zzp dp? and if so do you guys recommend it for my car?