Wow, that's so weird, 5 min ago I was brushing my teeth and for some reason I was wondering "hmm what's the the best exhaust for a crf150f" and then I come on here and see you wondering the same thing. That's freaky. Anyway, I used to have the same bike and ran the stock exhaust. Worked pretty good IMO. I took the carb in to the dealership to get it rejeted and that gave it alittle bit more power. I was going to take th Baffle out but they said that would make the bike run too lean and fry the valves. But if you get an aftermarket exhaust I would check out lexx (from rocky mountain) motoworks, dg,or bbr. Once again. Still can't believe how freaky that was
Is that not why you had it rejeted? Thats the only reason to rejet, pull the snorkel out of the intake, UNI air, baffle out of the exhaust, rejet, move clip and bang, instant fun.