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doubt itd hurt anything, but on a decent bike like the 400 i wouldnt do it. may loose performance. grab a slip on 4 it. thier under 200 bucks. make sure you rejet no matter what pipe you go with.
I just read a post a couple days ago where someone had put a cherrybomb on a quad, and they said it worked, until they melted the innerds. I would stick with a four-wheel compadible only, so you have a way less chance of ruining your engine. Thats just my opinion though