2009 yz450f- exhaust question

[TH moto]

Just got a fmf 4.1 slip on for my bike and wondering for those out there that bought this pipe if they changed their pilot or main jet. I know on my last bike I went with 48 pilot and it made a huge difference in low end but not sure on this new bike.

Thanks for any info.

[grayracer513]

Read:

https://www.thumpertalk.com/forum/showthread.php?t=327405