I have a 2000 4x4 with the 4.6, I live in Canada, and have been thinking what kind of exuast options I have, and what kinda price I am looking at. And what results I can expect, or the downs about changing the exhaust.

 

I too am a crazy Canuck and have a 2000 4X4 SC with the 4.6. I just recently installed a DI/SO Flowmaster (see post on this site). I'm happy with the installation and results achieved. Total cost with parts and installation was $500 CDN. You may do better or worse depending on where you go. There's a whole bunch of choices available to you so read them all and see what you agree with. There will be lots you won't necessarily agree with but everyone is entitled to their own choice and opinions.