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HDManny · 09-25-2009, 10:00 PM

The Crios mod is drilling a hole into each exhaust exit of your muffler. There are detailed instructions on this forum, just do a search for "Crios mod". Some have actually drilled two holes per side.

09-25-2009, 10:00 PM	#12
HDManny Registered User Join Date: Jul 2009 Location: Clarksville, TN Posts: 54	The Crios mod is drilling a hole into each exhaust exit of your muffler. There are detailed instructions on this forum, just do a search for "Crios mod". Some have actually drilled two holes per side.