I love the Q4 Exhaust for Yz450!

With this exhaust i notice more traction and no loss of power this is a great pipe for the Yz450!

If you need to meet sound requirements this is an awesome buy! :)

Good to know. I'm looking for a new muffler for my '04, but haven't made up my mind yet. Did you get a slip on, or did you get a header with it?

Just the slip on the header increases the efficiency of everything

i dont think ide ever get the header unless i wreck mine the thing runs great as it is :)

Thanks for the info.

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