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IROC'em · 03-23-2007, 02:42 PM

I dont know havent heard of them. I would guess they have holes "ports" on the headers to let excess air out to reduce backpressure further or let air into the pipes to get better flow.

03-23-2007, 02:42 PM	#2
IROC'em Drives: Chevy 1500 5.7L Vortec Join Date: Jan 2007 Location: FL, Go gators! Posts: 172	I dont know havent heard of them. I would guess they have holes "ports" on the headers to let excess air out to reduce backpressure further or let air into the pipes to get better flow.