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Back pressure is due to any restriction in the exhaust system, beit a turbocharger, catalytic converter, small exhaust, low flow muffler .... problems associated with it, can be high egts (read as inaccurate readings for the gauge when tuning), a non optimal producton of power, exhaust/inert gasses being left or pushed back into the cylinder which in turn leads to less overall oxygen in the cylinder and less power.

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