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You are going to be increasing your airflow so you will most likely have to add more fuel by rejetting.
 

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Agree^^^^!!But you'll add a little horsepower by doing this.
 

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is that particular model FI?? I know the 420s are if it is then jetting is not an option, it would have to be programmed.
 

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I don't think any of the 350 or 400 Ranchers were FI. I think they started FI with the 420 Ranchers.
 
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