Hey guys (first post ever here so if its not in the right section you can delete it )

I've got a '06 XTR with following setup:

-Stage 1 K&N airfilter
-Kev's mod
-And i was running the laser produro slip-on cans and with that it was running fine.

Now i've changed the exhaust with the OTR 2in1 in combination with 1 laser can for more ground clearance.
And my bike is stuttering in the lower-mid rev range when accelerating ever since the exhaust swap (mostly in 1st and 2nd gear).

I've already changed the plugs to the NGK CR7EIX iridium plugs.
Checked the exhaust for leaks
tryed other settings on Kev's mod.
Checked the Diag and the only error code was that the bike was dropped. (i go offroad from time to time )


Maybe you guys know the cause of the stutter?