Monster S2r/s4r Db Killers

Hi all,

I´m looking for db killers for my Termignoni 45° that I have installed on my Monster S2R.
I've looked on internet, local dealers and haven't had luck..
There are many on ebay but I'm not sure which ones are the good ones for those exhausts..
Can anyone please help me find them?

Thank you,
Nuno

 

That's my main doubt.. And I need 2
Thank you for the reply (Y)