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Message: <blockquote data-quote="shiroitenshi" data-source="post: 1452090" data-attributes="member: 27518">I myself don't know how to see, since I'm not a welder by trade.. but from what I asked people, the reasons the welds come off is that the welder didn't heat the part they weld properly.The leaks are sometimes big, and sometimes small. As to how you know it leaks... the exhaust smell (actually petrol-like smell, since carbon monoxide is supposed to be colourless and odourless) usually gets into your aircond, so that's usually a sign.As for how the extractor leaks.. the weld spots get loose/tear from vibrations of your daily driving. In malaysian roads, even the turbo'ed cars with giant turbine have to fabricate a bracket to hold the turbine so the manifold won't come off at the weld seams (and we're talking branded HKS products here!)As for the flow.. just make sure there's nothing in the pipes.. I've once seen a beautifully made extractor which was chromed and had quite okay looking welds on top... I looked inside the pipe, and there it was.. a lot of lumps of welds inside the pipe. It's okay for looks, but performance wise.. restrictions oh!</blockquote>

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