Dont know if you still look at this but, my bros old indy had single PSI racing pipe on it. It sounded sweet and weve never seen one again. It was just a single pipe just like what came on the sled but sounded sick!
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Current sleds:
Mine: 1985 yamaha ss440 4067 miles- just sold for 450
1990 polaris indy 500 SKS special
they probly made twin pipes but might be hard to find, search ebay and you will find a dg single pipe. My friend had a indy5 with it and it sounded good
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