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Old 02-07-2013, 01:42 AM
ElSombreroNegro's Avatar
ElSombreroNegro ElSombreroNegro is offline
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take it from someone who runs a 350 with open long tubes at the track: unless you are running lean, lack of back pressure will never ever burn your valves.

Also, back pressure is always, always bad and never ever ever any good, ever. (unless you run a turbo with it). What you REALLY want is high exhaust velocity, low back pressure, and tuned primary lengths to optimize exhaust scavenging through carefully timed pulses creating a vacuum signal on the valve behind the outgoing exhaust pusle, which is a fancy way of saying the POLAR OPPOSITE of back pressure. THIS is what helps your low end torque by increasing your volumetric efficiency.
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