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Originally Posted by mn_vette
So what actually causes back pressure? I'm an engineer so feel free to get technical.
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Mainly it is a restriction that is causing the backpressure whether it is the muffler or the turbo itself. Intern it can also cause damage to the motor too. Here is a link that I found that might give you some more details..
http://superchevy.com/technical/engi...exh/index.html