HMF Slip on & FMF Powerbomb header tuning

[300exBorg]

I just got a FMF PowerBomb header to throw on my 2003 400ex. I already have a HMF slip on installed. My jetting is actually pretty rich right now but is running fine, 165 main 42 pilot. Should I just keep my jetting at 165 when I put on the header today? I have a 170 and 172 main jet but I know 165 is pretty rich for what I have on my bike WITHOUT the header. What do you guys think I should do?

[ish416]

I don't remember exactly but I don't think I needed to rejet when I installed my Powerbomb.