The cat has tiny perforations yes but it acts as a baffle hence increases backpressure, remove that and your low end torque goes if you do not replace it with a correct dia pipe.
Yes it is important to calculate your exhaust system before you install it for the best benefits.
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“Every man is guilty of all the good he didn't do” - Voltaire
Last edited by Psycho : 5th November 2005 at 00:54.
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