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by noonespecial
2429 days ago
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Pollution concerns aside, your valves are timed and the manifold ports are shaped to work with the back pressure provided by a working cat. If you didn't compensate for this during the modification you've likely cut the working life of you head(s) by half. |
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This is a 100% urban legend BS myth.
There's a partial exception for two-strokes where if you tune the system right you get a resonance wave that lets you pack a little more mixture in on the intake/exhaust stroke. Literally no 4-stroke ICE benefits from back-pressure in any way. It's just that sometimes the things done to reduce back-pressure (small exhaust pipes being the primary one) seem like they would increase it and vice-versa hence the urban legend.
Edit: Who the heck is downvoting this? This is how ICEs work. Google it if you don't believe me.