I have purchased a UNI air filter, and removed the air box lid and put one of those stretchy book covers over it (like a pre-filter for better air flow) and I have purchased one of those 2R racing billet exhaust tip/cap for my 2002 250ex. I need to reject but I don’t know what jets to use.

Please leave a link to the jets or at least tell me which ones to use

Thanks!