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Take it off, backpressure does nothing for you.
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Sorry, but I'm gonna have to say this is wrong
It's a common misconception, Backpressure does nothing for you
IF YOUR FULL THROTTLE RACING!!
you need backpressure IF you have AN EXHAUST SYSTEM AT ALL, Or else economy is screwed up.
exhaust basics
Here's some things about exhaust basics. Notice how the plume distances are important? we need backpressure at cruising speeds, but not during acceleration. For HP we need no backpressure, for efficiency we need backpressure.