Thumper Racing Exhaust Insert

I went to a junk yard to get a few parts, and didn't really even notice it until I was about a mile away... "Wait a sec, this thing wasn't that loud before." Someone yanked my thumper racing insert while I was at the junkyard.

Anyway. I was thinking of just making my own. I glanced at it before and it looked like an incredably simple part. I'm not sure why I could make one for under $40. Would anyone be interested in one if I made them?

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2000 WR400F - Thumper Racing Exhaust Insert, Throttle stop shortened, Grey Wire Cut, Filter Cover Removed...

I'm surprised that there was no interst. Do the inserts not work on other exhaust kits, or are there just not many people with a factory exhaust here?

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2000 WR400F - Thumper Racing Exhaust Insert, Throttle stop shortened, Grey Wire Cut, Filter Cover Removed...

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