If you get down (underneath) and look up at the end of the pipe you'll see a small hole.
The hole is in the shiny bit at the end of the carbon.
stick a small allen key in the hole and turn.
You'll remove a small screw/bolt.
once its out you can pull the baffle out.
repeat for the other side.
There is some pics of the hole here
They will pop and fart with the stock ECU.
I got a DP ECU and open airbox.
Unfortunatley the idle was anywhere between 1800 and 2500rpm.
The dealer said nothing can be done due to the stepper motor.
I put the stock ecu and airbox back on.
Idle was way to high.
I'm trying to get a normal idle with the DP ECU
Some stuff re the S2R1000
and the last paragraphs on this page