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S_M · 07-09-2012, 01:03 PM

I haven't experiened any difference. I'm not sure how a closed flap in the exhaust would make milage worse, if anything I think it would be better. Either way I think you would be measuring hundreths of a mpg...

07-09-2012, 01:03 PM	#12
S_M Lieutenant 67 Rep 549 Posts Drives: Many Join Date: Jul 2007 Location: X5 iTrader: (0)	I haven't experiened any difference. I'm not sure how a closed flap in the exhaust would make milage worse, if anything I think it would be better. Either way I think you would be measuring hundreths of a mpg...
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