I read every thread about the M4 Street Slayer on CBR250R.net forum and couldn't find ANY negative comments about it other than a couple comments that it was way too loud without the dB killer installed.Unfortunately, the Street Slayer has too small volume and area to do it's job. It is way too loud for the street with the db killer out. And it is too restictive with the db killer in, giving less power than stock. Everybody on the CBR250R forum that tried one ended up getting rid of it. For any of these essentially straight through glass packs, the bigger, the better.
M4 without baffle?Quick comparison between Graves slip on and M4 Street Slayer.
Graves start and idle
Graves low to mid revs.
M4 STreet Slayer
I will not call it quiet at all, but its not insanely loud.
All you are really doing is replacing the muffler box and silencer with a single slip on can. The exhaust remains stock from the exhaust port in the head to about 1" in front of the O2 sensor bung.So what is the general consensus regarding a re-map for this exhaust? I love the sound, but I'm really not interested in doing a remap just for a slip-on. If I plan on leaving the db-killer in would be fine over time without the re-map, or is the removal of the stock headers going to require a re-map no matter what?
All you are really doing is replacing the muffler box and silencer with a single slip on can. The exhaust remains stock from the exhaust port in the head to about 1" in front of the O2 sensor bung.
Only thing I have found with mine that may need addressed is that it likes to fart fire on high RPM quick shifts and on throttle let off at highway speeds.