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07 yz450f jetting/exhaust

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So I rejet with a dynojet kit with 160 main and new needle in same position. says its for aftermarket exhaust below 3000ft. So I dont have the exhaust on yet but even with the fuel screw out most of the way it still crackles/pops as you slow down from mid-low rpms. high rpms have no popping. but i was thinking that if i put a slip on exhaust on my bike it will make it run even more lean, more than it is now. this jet should make it richer no doubt? i also have a size larger pilot jet ordered just in case. thoughts?

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also, its only about 5 degrees out. but it ran slightly better the other day at about 5 degrees warmer temperature before i replaced my fuel screw.

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Maybe raise the needle one position. You might want to try some different pilot jets since it is mostly problematic off bottom.... My $.02

I'll look to see what mine is jetted with my slip-on.

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