.:HSTuners::

*AzCivic* · 03-17-2004, 04:41 PM

copied from magnaflow's website for your reading enjoyment:

BACKPRESSURE = TORQUE?
An old hot-rodder's tall tale: Engines need some backpressure to work properly and make torque. That is not true. What engines need is low backpressure, but high exhaust stream velocity. A fast-moving but free-flowing gas column in the exhaust helps create a rarefaction or a negative pressure wave behind the exhaust valve as it opens. This vacuum helps scavenge the cylinder of exhaust gas faster and more thoroughly with less pumping losses. An exhaust pipe that is too big in diameter has low backpressure but lower velocity. The low velocity reduces the effectiveness of this scavenging effect, which has the greatest impact on low-end torque

View Poll Results: Which header is better?
A 4-2-1 System	11	68.75%
A 4-1 System	1	6.25%
Exhaust? Header? What's that crap?	2	12.50%
Motors? Screw motors!! My car runs 9's on STOCK INTERNALS!!! HAHAHA....cough	2	12.50%
Voters: 16. You may not vote on this poll

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03-17-2004, 04:41 PM	#21
AzCivic Moderator Join Date: Feb 2002 Location: Az Age: 44 Posts: 3,804	copied from magnaflow's website for your reading enjoyment: BACKPRESSURE = TORQUE? An old hot-rodder's tall tale: Engines need some backpressure to work properly and make torque. That is not true. What engines need is low backpressure, but high exhaust stream velocity. A fast-moving but free-flowing gas column in the exhaust helps create a rarefaction or a negative pressure wave behind the exhaust valve as it opens. This vacuum helps scavenge the cylinder of exhaust gas faster and more thoroughly with less pumping losses. An exhaust pipe that is too big in diameter has low backpressure but lower velocity. The low velocity reduces the effectiveness of this scavenging effect, which has the greatest impact on low-end torque