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Very tempting. I assume a fuel controller is recommended, but is it required for this exhaust?

I'm not necessarily after max power gains. I just don't want to lose power or have a poor power curve.
 

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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.
 

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That's a great video. I like watching someone actually do a mod than just looking at paper instructions. Might have to do this one myself.
 

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.


We've sold a few of these already.

Feedback thus far has been good.

Their Dyno shows a little gain in HP, of course that's assuming the db killer Is removed.


Can't argue with removing 11 lbs.








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Discussion Starter · #9 ·
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.
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.

There were, however, many positive comments about the bike having more power and reving more freely at higher rpms with the M4 installed.

Can you direct me to comments from any/all the forum members that complained about it giving less power than stock with the dB killer installed and about them getting rid of it?

Thanks...
 

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Probably if I tried. It is obviously better for power if a muffler takes away noise by volume. Not restriction. The twin of the R3 might not be quite so ridiculously loud with the Street Slayer as the CBR250R is. There is something about the boom from the single cylinder that made it really loud even when just cruising through town.
 

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I like loud, loud is good, looks great only downside I can see it picking up a lot of rocks chips being so low but that's really good looking system utilizing the stock headers.
 

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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.
 

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Should have clarified. DB killer is still in. I asked Brian Van about it at STG and he suggested leaving it in. I am sure that with some fuel mapping changes taking it out would free up a little more power, but I was advised that removing it resulted in reduced response and performance. I have no complaints about the way the bike behaves with the DB killer installed. One of these days I need to strap the go pro to the bike and get a few runs in for audio of the exhaust while on the road.
 

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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?
 

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I just put a M4 slip on my R3 an absolutely love it. Not a huge performance gain, but she sounds like a beast even with the DB killer in.
 

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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.
 

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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.

I was told a fix for that is the air block off plate.
 
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