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Discussion Starter · #1 · (Edited)
I said all along I wasn't going to change the exhaust on the FZ but because I like quiet bikes. Now second thoughts are starting to creep in. The db killer only loses 2-3 horsepower and losing 8 - 9 lbs. would be nice plus I want to hear the triple wail. So, at below 6k rpm, how much louder is the carbon Akra with db killer than stock? Above 6K rpm I don't care because that's only for short periods and usually no one else is around. Informed subjective and objective replies appreciated.
 

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I have the carbon akra exhaust but I removed the db killer before I even installed it. It is quite loud for sure. The noise it makes is somewhat addictive, it sounds like a race bike. I would say it's at least twice as loud as stock.
 

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If you want a little more noise...the AKRA CARBON is a mistake. That system is really loud both with the baffle and without. AKRA TITANIUM is a bit louder than stock with the baffle and with the cat converter installed. And you won't need a fuel controller if you run it that way. The Arrow and the Yoshimura systems are a bit louder than the Akra Titanium...but you WILL need a fuel controller with those.
 
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I have the Akra carbon and don't consider it overly loud at all. I don't feel the need for earplugs and it gives a beautiful, lower frequency rumble and slight sputter w/ the stock ECU. Highly recommended!
 
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The Akra carbon is definitely a lot louder than stock, but that isn't hard to accomplish. The stock muffler is very quiet. That said, the Akra carbon w/ baffle in isn't very loud unless you're WOT. Even then, it's quieter than the M4, Arrow w/o baffle, etc.
 

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I believe the stock was around 88 dBs at 5K RPM??

I measured the sound with a meter when I installed my Akra Carbon.

5ft away at idle
with dB killer - 91dB
w/out dB killer - 99dB

For general sake...I might tack on 5 dBs on each for 5K RPM...
 

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Discussion Starter · #9 ·
I believe the stock was around 88 dBs at 5K RPM??

I measured the sound with a meter when I installed my Akra Carbon.

5ft away at idle
with dB killer - 91dB
w/out dB killer - 99dB

For general sake...I might tack on 5 dBs on each for 5K RPM...
Three dB difference at 5k with the dB killer isn't much difference.
 

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Three dB difference at 5k with the dB killer isn't much difference.
I would say at 5k rpm the Akra with dB killer would be around 96 dB. Just a guess though. I'll grab the sound meter from work and measure this week.
 

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I work 2nd shift so when I get to my road I run a higher gear and lower rpms so I don't piss off my neighbors to much. Its easy to just chug it along with all the torque. But having the extra noise going home at night I hardly see any deer or there usually heading for the woods. When I drive the suv home I almost always see deer and have hit raccoons that I don't think I could have avoided on my bike!
 

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Can the carbon Akra system be run without baffle, or does the map need to be updated?
I've seen many clips with blue flame and backfire on closed throttle.
 

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Discussion Starter · #13 ·
Listened to DTM74's bike yesterday, not too loud, then ordered the pipes. $755 all in from MotoMummy. Thanks Dan.
 

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Can the carbon Akra system be run without baffle, or does the map need to be updated?
I've seen many clips with blue flame and backfire on closed throttle.
The Akrapovic is a full exhaust system including headers and has no catalytic converter so a tune should be done regardless if you run with or without the baffle. If you don't get tuned the engine will constantly pop and backfire extremely loudly alerting the po-po to your whereabouts. The blue flames only happen if you have backfiring.
 

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I have a few hundred kms on my akra carbon with the db killer and it is definitely louder but not obnoxious IMO... and my neighbors :D does pop and bang but im sending my ecu out to get tuned, that should fix it I think
 

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I have a few hundred kms on my akra carbon with the db killer and it is definitely louder but not obnoxious IMO... and my neighbors :D does pop and bang but im sending my ecu out to get tuned, that should fix it I think
I will partially agree with that.. At low rpms it's quite civilized, but when you get into it hard, and without the baffle it's fairly obnoxious. I love it personally, it completely transformed my bike into Jekyll & Heide, the best mod so far bar none :evil6:
 
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Darksyde- I see Nels did your tune? Any numbers you mind sharing hp&lb/ft?
No data sorry, the tune was a flash based on other 09's that had the same Akra exhaust as me. Nels assured me I would get 125+ hp with my setup and it feels like it. I've gotten much better at cornering since the tune because the bike is more predictable and less snappy in gears 1 & 2.
 

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I would be nice plus I want to hear the triple wail. So, at below 6k rpm, how much louder is the carbon Akra with db killer than stock? Above 6K rpm I don't care because that's only for short periods and usually no one else is around.
I love the sound of the Akra with the baffle in, I have no need to remove it. As people said, it starts off relatively quiet (low rumbling sound), and then screams like a racing bike when you twist it.

I have no idea how you manage to ride under 6k most of the time. After reading this post of yours, I started looking at my rev meter during my ride to and from work and I'm over 6K for 90% of the time. It just sounds so sweet, that you don't want to release the throttle :).
 
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