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post #1 of 2 (permalink) Old 07-24-2013, 12:17 PM Thread Starter
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Join Date: Apr 2011
Location: Minnesota
Posts: 15
Question Exhaust

I read somewhere that I could drill a 3/4" to 1" hole in the very back of my exhaust and it would increase my horsepower. I have a 2006 Polaris Sportsman 500EFI. Would this mess with the EFI as far as back pressure goes, or would I be good to go with that?
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post #2 of 2 (permalink) Old 07-24-2013, 03:14 PM
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Join Date: May 2012
Location: Saskatchewan, Canada
Posts: 572
Just sound. No power.

They run rich already, won't need to worry about efi mapping.

2012 Sportsman 800
-Engine
-4 Tires
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