ya my cat rattles also so ima get a new oni got off ebay for like 65$ put on today at 3pm....
i've already replaced the cat once cause it was so clog'd i could'nt even really drive my car..lol
now not even 2 years later this one is bad also but i sum how must have hit it on sumthing to make it break loose inside..so idk
but ima getit fix'd today...

 

Sounds exactly like what is wrong with mine at the moment. Did you get a universal cat or a high flow?

 

Is there any other place to get a high flow cat for a good price. I don't really do ebay.

 

Auto source, NAPA etc... any of these places will sell a high flow car, I liked the magnaflow ( before I went catless ) and its around 80- 100 bucks, depending on where you get it..