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Message: <blockquote data-quote="Veloc" data-source="post: 1063373549" data-attributes="member: 92511">Bro... Reduced back pressure is good. But not too low and especially not zero. Think of it, if back pressure is zero, some of the exhaust might flow back in the pipe ruining the flow of your exhaust. Some amount of back pressure is required to make sure the flow remains smooth and fast right until your muffler. The fast flowing exhaust is good to get scavenging effect out of your engine. I would say if you use your car a lot in the city, tune it for best low end torque. Stick to factory size +/- 0.2". For extractor, use 4-2-1. Oh ya, if yours is auto, better stick with 4-2-1, and factory piping... It kills, trust me T.TPlease do not de-cat. Let us be responsible drivers. Don't spoil environment. De-cat gives your a bit on improvement but very minor. Unless you re-do the whole system for decat from the extractor, piping, resonator, silencer, and muffler. Just doing a de-cat itself have very little effect on power but has a bad effect on environment and noise. so for that little bit power increase, better change your air-filter or iridium spark plugs <img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/listen.gif"  class="smilie" loading="lazy" alt=":listen:" title="Listen    :listen:" data-shortname=":listen:" /></blockquote>

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