M4 Performance Exhaust Q4 Stage2 dB silencer quiet insert for M4 Street Slayer muffler

This was a direct replacement for the stock db killer on a Street Slayer exhaust. It fit perfect very easy to remove and replace. The sound is the same at start up and on the bottom end. The difference is on the top end it made a big difference in the amount of sound much quitter. I couldn't tell any difference in power or performance only the sound while ridding.

Bought this for my gsxr. It made it more tolerable when riding but nothing too drastic. Just less drone

Tried the Street Slayer stock on my XSR900. Sounded great, except the drone was too much for while riding. Put this in and reduced the sound down to “just right”. Gives it a nice throaty sound without the drone and won’t piss off my neighbors… as long as I don’t throttle too much until I get out of the neighborhood.

Fits my fz09 m4 exhaust. Basically a double of what the stock silencer is but absolutely quiets it down in the top end. Down low it is still very throaty. Very happy.