I've got a bone stock 2005 YFZ 450, and I want to do an exhaust system to get more power and speed all throughout my powerband...but I don't know which pipe to use! I want to go as cheap as possible, but I understand that you get what you pay for....please, someone help with any suggestions!

 

Try doing a search. This same question gets asked 5 times a week, and i'm sure people are getting tired of answering it.

 

I would say check into the Dr. D or HMF. HMF's new Ironman series supposedly has a different header than the others that gives it a bit more power. Both of those systems can be had slip on or full exhaust for a reasonable price, and both have top notch quality. There are plenty of good systems out for the YFZ though. Search, search, and search again.