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I replaced the exhaust system on my RZR recently and it is running very bad! it smells like it is running to rich. I can pull the new air filter out and it runs a little better but still wont go over 45 mph. i have replaced the plugs and wires already. it has been suggested that i have to get a fuel mgt module.
 

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sounds rich Just, are you sure the TBAP harness didn't get damaged putting the new exhaust on ? It ran fine before the new pipes ? Did check for stored EFI codes ?
 

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I replaced the exhaust system on my RZR recently and it is running very bad! it smells like it is running to rich. I can pull the new air filter out and it runs a little better but still wont go over 45 mph. i have replaced the plugs and wires already. it has been suggested that i have to get a fuel mgt module.
Like JM said check for damaged wires. If you need a fuel tuner,here you go.

Fuel Moto Micro EFI Tuner
 
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