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Old 08-10-2013, 11:41 AM   #8 (permalink)
ksa8907
Master EcoModder
 
Join Date: May 2012
Location: Tampa, FL
Posts: 1,745

Volt, gas only - '12 Chevrolet Volt Premium
90 day: 38.02 mpg (US)

Volt, electric only - '12 Chevrolet Volt Premium
90 day: 132.26 mpg (US)

Yukon Denali Hybrid - '12 GMC Yukon Denali Hybrid
90 day: 21.48 mpg (US)
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My intrepid has a center resonator that is 2-1 then a muffler and a second resonator at the rear. A long time ago I chopped the rear resonator and muffler off and the car sounded real good at idle but had a horrible drone. I installed a "glass pack" and no more deafening droning noise and is actually quite tame. I suggest about 18-24 inches of pipe after any sound altering device you use.
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