As long as the air/fuel ratio is correct you won't do any motor damage. So either rejet or get a fuel programmer that you can create your own map, Such as MSD. Then you need a air/fuel ratio gauge to create a map.(only applies on a fuel injected machine) When i put Duals on my Rhino I had to add 23% more fuel to certain areas of the RPM range.
I'm thinking with your exhaust being that big that you are going to be running REALLY lean and losing power.
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