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Exhaust pipe extension

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Larry Lyons

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Is there any accepted minimum amount of pipe that should extend out of the bottom of the cowl? If I stick them out an inch I would be above the coil spring suspension. To get below I will have to let the pipe extend out at least 3". Not a problem just looks like a lot to me, or do I shorten them a little and let the exhaust impinge (blacken) on the landing gear a bit?

L
 

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