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Discussion Starter · #11 ·
From what I have found the exhaust from the 650 aftermarket will fit but the 400r has an o2 sensor built in where the 650 doesn't so if you put a 650 exhaust the fi light will always be on... I just want one designed for the 400r
 

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Mumbles, there are some exhausts for the European market that have a bung built in for the O2 sensor. They are not always easy to find but they are out there, or if you have someone cluey with a welder, you can weld a new bung into the pipe to handle the sensor like I did.
 

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Discussion Starter · #18 ·
zandit said:
Mumbles, there are some exhausts for the European market that have a bung built in for the O2 sensor. They are not always easy to find but they are out there, or if you have someone cluey with a welder, you can weld a new bung into the pipe to handle the sensor like I did.
Never thought of that i do know some people handy with welding... Thanks for the idea
 
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