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VW got rid of his trap oxidizer which accounts for the increase in HP
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Removing the trap oxider is more than removing just a little restriction. If I remember correctly it's more than 15 psi restriction of the exhaust! It's removal increases hp by 5+ hp and improves fuel economy by maybe 10%. It has NOTHING to do with the air filter. Please put a proper air filter on it so that it lasts a while.
Marshall