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2009 yz450 exhaust

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Hey guys, just got a new powerbomb header and powercore 4 pipe for my 09 yz450, wondering if anyone has recommendations on what the jetting settings should maybe be changed to so that she still runs prime. Thanks!

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With the odd exception of the '08 and '09 models, the factory YZ4xx exhaust performs well enough that the jetting rarely changes much at all when switching systems.  The double-baffled "shorty" pile of junk the '08 and '09 came with could be different, but it could also go either way.

Try it without changing anything and see how it works out.

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