ok so i have a 2000 v6er. right now i have cat back flow pro exhaust system. i was wondering would it make a sound difference if i just took out the pre cats or would i have to remove all four to make a difference? thanks

 

if you are going to remove any cats remove the rear 2 they are for california emmissions only and are not monitered by the ecu so if removed car will still run fine the first 2 are to meet federal and is monitered by the ecu and will throw a code if they are removed and you will need mil eliminators or a sct to remove the code and get it running normal again

 

An o/r h mid pipewith flowmasters sounds good.

 

I agree, remove the rear cats. They are bigger and muffle the sound more anyway. I removed mine and it sounds a lot better but not it's so loud to be annoying.

 

Cats, what are cats?[8D]

 

i live in nebraska so emissions really arent a problem around here.

 

I live in california so I was wondering if you take the 2 rear cats off will you not be able to pass smog?

 

Well you might as well get longtubes if you want your car really sounding good.