Gen 1 exhaust fitment.

As long as it is designed to fit on the Stock Headers I am sure it will be fine.

I too have a 2003 FZ1.

As far as performance goes, You probably won't notice any difference. I swapped the entire stock exhaust on mine for a full Yoshimura system to get the sound I wanted, but nothing really changed when I twist the throttle.


I did find that the Yosh pipe that comes with the full system is not a slip on, the fitting only worked on the Yosh Headers.
 
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