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Message: <blockquote data-quote="yytellmey" data-source="post: 1019638" data-attributes="member: 18704">Hi to everyone.Exhaust Gas Recurculation (EGR) is actually a small valve that recirculate a small amount of exhaust gas back into the intake manifold.They were designed for that because some ppl claims that by sending warmer gas into the combustion chamber, the air/fuel mix does not have to do as much work to heat up, and your engine runs more efficiently or even has a cooling effect on combustion temperatures that helps reduce the formation of oxides of nitrogen.-----Ok my question is here:Recently i saw some car modify magazine (Taiwan)They have a DIY section that they teach us how by-pass the EGR valve. They claimed that the EGR is useless because it recirculate unclean/burned air into your engine. It defeats the purpose of having air filters (air filters to filter the air to make it clean).And they claims that by by-passing the EGR, engine will have more clean air to burn thus increase in horse power (slight increase)But i have did some "google" research about EGR, some website claims that if the EGR valve is closed (by-passed), it will cause Detonation and Spark Knock. Is this true?The reason i asked this question is, i wanted to by-pass my EGR valve (its very easy to DIY, even kids can do it) but i dont dare to do it. Im affraid of side effects (damage to engine, heavily increase in fuel consumption...etc)And 1 more last question, by-passing EGR is legal or its illegal in Malaysia? Im affraid if i by-passed it and some JPJ/police pop my hood up, thats gonna be my end.... :frown: Thx in advice.------Here are some pics of EGR Valve:http://www.carcarecouncil.org/images/emission_control/egr.jpghttp://www.slidingdelta.com/fsj/egr.jpgIts pretty easy to locate, it usually looks like a UFO that is gold in color....</blockquote>