Someone told me that their PC pipe came with a recommendation to change their jetting, and the settings to change. I ordered my pipe from an online store and it came w/ nothing but the pipe. So I took someone's advice and called PC.
The call consisted of...
Receptionist: "wah wah wah, how can I help you"
Me: "can I have the tech dept?"
Receptionist: "do you haven an engine related question?"
Me: "yes"
Receptionist: "let me give you (forget name)"
Me: "thanks"
Whoever: "this is whoever"
Me: "hey, I just bought your pipe and shorty exhaust for my bike. do you recommend changing my jetting with this setup"
Whoever: "oh yeah. what kind of bike"
Me: "99 kx125"
Whoever: "ok, just give me a sec..."
Me: "no problem"
*hold for a few*
Whoever: "sorry about that, 99 right?"
Me: "yep"
Whoever: "ok, stock main, 50 pilot, 2nd clip on stock needle, air screw at two turns out but you can vary that to your liking"
Me: "how about the plug? same one as stock?"
Whoever: "we dont have a note to change it, so I'm assuming yes. mix at 32:1"
Me: "Ok, I'll start from there, thanks."
Whoever: "Not a problem at all, take it easy"