Sputtering exhaust

[LSD4me]

Hi all!

I'm having an issue with my 09 M696

I completed the 12k service a few weeks ago which included a pretty good breakdown and assembly of the whole bike

Last week I noticed my exhaust started sputtering all the time...

It is a new sound that was never there before

I am confident I tightened and torqued the exhaust on to specs

There is no performance or power decrease just the exhaust sputtering

She idles fine and the sputtering is coming from the exhaust...the engine doesn't seem to be choking and the problem happens at idle and through every gear...

Does anyone have any ideas as to what I should do to fix it?

TIA!!

[LSD4me]

! Bump !

Any ideas as to where to begin looking?

[Raux]

sputtering from the head?
or just burbling from the end pipe