This is for an 81 300SD but I do have two others with the same (917.xxx) engines and was wondering just how important this bypass pipe is. The reason I'm asking is, I cannot find the bonjoe(hollow) bolts to replace one that I heavy-handed and stripped out. Now I have a slightly bigger hole and threaded it with a M8x1.0 tap but the good bolt just slides into and out with slight drag. I will probably repair the hole that stripped and get a new bolt but I was just wondering about this in the meantime.

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1981 300SD