Stock pipes, w/o silencers?

[ah2009]

I recently bought my first banshee and now just got done rebuilding the top end. When i got it, it only had the stock pipes with out the silencers, for the exhaust. The jetting is stock. Is it bad to run it with out the silencers? I would think that the jetting should be different if ran without silencers. And should i break the motor in using the setup that the owner before me had it? (stock jetting, no silencers) or should i get a new set of pipes and exhaust, and rejet it, while im breaking it in? I would like to hear it run, to be sure that there is anything else major wrong with it before i go and spend the money on a set of pipes and silencers. I tried to make this as clear as possible, but let me know what your opinions are and what you would do. Thanks!!