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IINM, the only time I've heard of them being used was in the '86 Plus with the 521 motor. I'll email my bro to find out for sure. He had a booklet from Ski-doo with info on trail & track mods. I think you have to be careful doing something in this area. If too much heat builds up in the pipe you'll end up with motor problems.
 

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Try and get a hold of member Cudney Racing..he'll have the info you're looking for.
 

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Good idea Rocketman
I don't think this is an area where you indiscriminately just start doing things.
 
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