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4406pack · 07-01-2008, 09:13 PM

if these plugs will increase hp, then you should see an increase in mpg as well...you would think....

07-01-2008, 09:13 PM	#15 (permalink)
4406pack cone destroyer Join Date: Mar 2008 Location: champaign, IL Posts: 499	if these plugs will increase hp, then you should see an increase in mpg as well...you would think....