Looking For Exhaust

im going to start working on my yz426f soon and i need a new header and exhaust for the header im going to get the fmf powerbomb header and i was looking between the fmf powercore 4 and the fmf powercore Q4 what do you guys think i would like to get a white brothers but i only have a budget for $350 for an exhaust i looking for a good exhaust with a decent power gain

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