I noticed that this slipped by in earlier posts
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On an NA it can, due to the loss of backpressure and burning out exhaust valves
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NO! NO! NO! You don't need backpressure. Backpressure is always the enemy. No backpressure burns out exhaust valves is a myth. Backpressure increases torque is a myth. Fight the convention (and the muffler shop "gurus"). Backpressure is always evil.
However...what you do need, in any engine system, is high flow velocity, which helps with scavenging. The only way to increase flow velocity (with the same engine size, boost level, and RPM) is to decrease piping size, which in turn, increases backpressure. Backpressure is a by-product of something good. But it doesn't work in reverse. You can add backpressure without changing flow velocity (by adding extra bends into the exhaust). This will only hurt torque/hp.
Dennis