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For more aggressive sound and a bit more performance gain go with the flat black GP slip on (also available in titanium).
M4 has the dyno #'s on their website.
 

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Discussion Starter #9
Alright i see. One last question so today i took off my oem muffler to clean the bike better from dirt and grime and started it for shits and giggles and it sounds amazing. I took it on a ride and love thes sound it made. Cat is still there just the big ass muffler. Can i run it like that until i buy the slip on? Since cat is still there i believe i still have back pressure?
 

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You should have a muffler. Also, wow, your neighbors must hate you. No muffler is probably well over 103+ dB ....
 

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^^^ gotta go with Gawernator on this one.

My '09 had the M4 GP slip on installed when I bought it. Sounds great at idle. Shrieks at full throttle, and is very, very loud. Like you can be heard from (quite literally) miles away. This means you are always on the LEOs RADAR. They can hear you coming from so far away, they have plenty of time to put down the doughnut, fold up their papers, figure out which way you're coming from , and get the RADAR gun out.

With the aforementioned irritation you will surely cause your neighbors -- who won't hesitate to call the LEOs and complain -- you are quite likely to find yourself with a significant detriment to enjoying your bike.

That M4 GP got me in front of a judge with a 'fix it' ticket, the second or third time the local LEOs pulled me over and got tired of giving me warnings about the noise. With a security clearance, I can't really afford to have negative press. I swapped out the M4 for an OEM complete exhaust, and have been hammering the bike nearly daily for the past 6 years. Not. One. Ticket. Not pulled over, since I went back to the OEM setup.

I can pin the throttle in any gear, without fear of getting the attention I do not desire. I can easily carry 15-20+ the posted limit, and not get a second look from any officer I pass. This has been the case, for 6+ years.

There are probably exhausts out there that can find that happy medium; no muffler at all, or a shorty muffler with a foot of glass pack on a straight through path is a cosmetic thing. Not a muffler, at all. A straight through glass pack design needs to be a couple of feet long, to have time to knock off the worst of the offending noise. The shorter the can, the more the high pitched, raspy part of the noise comes through. You don't really annoy people at idle..... it's when you run at some RPM that it gets obnoxious.

That M4 was stupid loud at anything over ~ 4K RPM. When the bike runs at freeway speed at ~6K, that means it's stupid loud all the time it's not idling. Hearing damaging, loud.

Do as you please; just expect that there will be a majority of people in your vicinity who do not appreciate your choices.
 

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Discussion Starter #12
^^^ gotta go with Gawernator on this one.

My '09 had the M4 GP slip on installed when I bought it. Sounds great at idle. Shrieks at full throttle, and is very, very loud. Like you can be heard from (quite literally) miles away. This means you are always on the LEOs RADAR. They can hear you coming from so far away, they have plenty of time to put down the doughnut, fold up their papers, figure out which way you're coming from , and get the RADAR gun out.

With the aforementioned irritation you will surely cause your neighbors -- who won't hesitate to call the LEOs and complain -- you are quite likely to find yourself with a significant detriment to enjoying your bike.

That M4 GP got me in front of a judge with a 'fix it' ticket, the second or third time the local LEOs pulled me over and got tired of giving me warnings about the noise. With a security clearance, I can't really afford to have negative press. I swapped out the M4 for an OEM complete exhaust, and have been hammering the bike nearly daily for the past 6 years. Not. One. Ticket. Not pulled over, since I went back to the OEM setup.

I can pin the throttle in any gear, without fear of getting the attention I do not desire. I can easily carry 15-20+ the posted limit, and not get a second look from any officer I pass. This has been the case, for 6+ years.

There are probably exhausts out there that can find that happy medium; no muffler at all, or a shorty muffler with a foot of glass pack on a straight through path is a cosmetic thing. Not a muffler, at all. A straight through glass pack design needs to be a couple of feet long, to have time to knock off the worst of the offending noise. The shorter the can, the more the high pitched, raspy part of the noise comes through. You don't really annoy people at idle..... it's when you run at some RPM that it gets obnoxious.

That M4 was stupid loud at anything over ~ 4K RPM. When the bike runs at freeway speed at ~6K, that means it's stupid loud all the time it's not idling. Hearing damaging, loud.

Do as you please; just expect that there will be a majority of people in your vicinity who do not appreciate your choices.
I'm In florida man no one cares how loud something really is lol. Plus i have no neighbors i have my own land. All i got to hear me are snake, racoons ansd opposums ?? all i asked for negative effects with no muffler until i get the slip on. Is easier to install it then putting everything back together. I still have my cat is not that loud. Is not straight pieped just no muffler i want to know if i can run it like that per say 2 months at max?
 

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I would have to say you are unlikely to damage the motor so long as the cat is still in the header. That's where the first reflection occurs that is the back pressure. The bike may run more lean than it already is, and that can cause burnt valves..... the ECU measures airflow into the motor and applies the fuel according to that by the mapping. As far as I know that means the change in restriction out back isn't going to affect the basic fueling delivered.

If the only place you ride the bike is on your own property, and you have a couple of miles of space between you and any neighbors, have at it. I don't think that's very likely.
 

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Discussion Starter #14
I would have to say you are unlikely to damage the motor so long as the cat is still in the header. That's where the first reflection occurs that is the back pressure. The bike may run more lean than it already is, and that can cause burnt valves..... the ECU measures airflow into the motor and applies the fuel according to that by the mapping. As far as I know that means the change in restriction out back isn't going to affect the basic fueling delivered.

If the only place you ride the bike is on your own property, and you have a couple of miles of space between you and any neighbors, have at it. I don't think that's very likely.
No i ride my bike anywhere and i will get the slip on. Just right now i don't have funds to buy the slip on i want. So once i put my m4 will i need to tune it or will i be fine just plug and play and ride? I'm still new to motorcyles so the more info i get the better.
 

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No i ride my bike anywhere and i will get the slip on. Just right now i don't have funds to buy the slip on i want. So once i put my m4 will i need to tune it or will i be fine just plug and play and ride? I'm still new to motorcyles so the more info i get the better.
You will only need tuning if you change the full exhaust system. I don't think the bike is going to run well with NO muffler on stock tuning but up to you. Not to mention the hearing damage
 

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Discussion Starter #16
No i ride my bike anywhere and i will get the slip on. Just right now i don't have funds to buy the slip on i want. So once i put my m4 will i need to tune it or will i be fine just plug and play and ride? I'm still new to motorcyles so the more info i get the better.
You will only need tuning if you change the full exhaust system. I don't think the bike is going to run well with NO muffler on stock tuning but up to you. Not to mention the hearing damage
It is running right. Just more noise. Temp is normal, idle is normal and still 41mpg. Looks like it has not suffered. Will update in a few days if it blows up lol
 

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Yeah u can run it without a muffler as long as you have your cats.

Personally, I dont like the sound of no muffler because it sounds like raspy diarrhea to me. I do love the sound of my M4 tho :D
 

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Discussion Starter #18
Yeah u can run it without a muffler as long as you have your cats.

Personally, I dont like the sound of no muffler because it sounds like raspy diarrhea to me. I do love the sound of my M4 tho <img src="http://zx6r.com/images/smilies/biggrin.gif" border="0" alt="" title="Very Happy" class="inlineimg" />
Hahahahaha m4 sound is pure sex. I agree. I will buy it in 2 months when i have the funds. Because bills comes first ugh. But idk man i kinda of like it is not that loud tbh. Since cat is still there is not stupid loud. But loud enough for cars to hear you. Do you have the carbon one or the flat black m4?
 
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