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Red · 06-16-2008, 09:27 PM

Sounds like all it does is plug up your exhaust. Once plugged your cat heats up faster which is where you probably see any FE gains.

06-16-2008, 09:27 PM	#11 (permalink)
Red Master EcoModder Join Date: Mar 2008 Location: SF Bay Area Posts: 713 Thanks: 1 Thanked 9 Times in 9 Posts	Sounds like all it does is plug up your exhaust. Once plugged your cat heats up faster which is where you probably see any FE gains.