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I just did a do it yourself repair on my 2006xb exhaust. I I put in a section about 6" long that has reduced the inside diameter of the pipe from 1 3/4" to about 1 1/4" for that 6" span. Will this reduction in exhaust flow hurt my motor? The section is right where the muffler connects to the main pipe.
 

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2006 Scion xB Automatic
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I'll let more experienced folks answer your question better, but I (being a novice car repair person) don't think exhaust diameter reductions will hurt your engine, but it will hinder performance...?

Sounds like your cat got stolen? Or was the pipe corroded?
 
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