For you guys who run track and trail...do you swap between the moto muffler and spark arrestor often...do you have to rejet or is it pretty close? I'm thinking about getting a FMF turbine core for my 2005 RM250 for trails but would like to swap back to the stock muffler for moto time. Thanks for the help!!!!!

idk about switching the entire exhaust but if you get one with a removable sparky you dont need to rejet

...I didn't know they had ones with removable sparky's.....no rejetting??

I have a pipe for the track and one for the trails, I dont rejet just swap them, I dont really notice a difference.