Q for Burned: jetting with Yoshi slip-on

For jetting purposes, is a Yoshi slip-on considered a modified stock exhaust or an aftermarket exhaust?

What jets/fuel screw settings do you recommend for a 400S with the 3x3 mod and a Yoshi slip-on at 1000-4000 ft.?

Thanks in advance.

dj kit

138 main jet

clip 4

25 pilot jet

2.5 turns fuel screw

thank you, sir.

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