Quiet Slip-Ons?
Road Captain
Joined: Jun 2012
Posts: 616
Likes: 0
From: GA
Take a look at big city baffles. Google it. It's the same thing only 100 bux cheaper.Doing this mod is a brilliant idea! I love my dragos pipes but on a long,long ride they get loud. I'm doing this.
Road Warrior
Joined: Oct 2010
Posts: 1,862
Likes: 126
From: Republic of Texas
Sorry, but going to Big City Thunder tells me nothing about what the "lollipops" do.
Elite HDF Member
Joined: Jun 2007
Posts: 3,873
Likes: 13
From: NW Arkansas
I have the stock baffle.......can't wait to hear your results!
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Ultimate HDF Member
Joined: Jun 2010
Posts: 5,105
Likes: 16
From: Blaine, WA
I would love to know the actual difference in decibels between the cat and no cat header for the Street Cannons. I have the Cannons on my '14 Limited and I'm trying to decide if I should replace the header pipe with one that doesn't have a cat. My indy mechanic tells me volume of the Cannons will increase 5-8% over the stock pipe with cat.
Seasoned HDF Member
Joined: Mar 2009
Posts: 24,654
Likes: 9,114
From: Snow Hill, NC
Looks like I will have to modify the mount as the stock baffles are a bit different angle at the outlet...
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Ultimate HDF Member
Joined: Jun 2010
Posts: 5,105
Likes: 16
From: Blaine, WA
Just got back in from another test, again this time with:
Stock cat equipped header
Stage 1 intake
PV with canned map from Fuel Moto - fyi, the map is for no cat pipe)
SE Street Cannons
For starters it sound much nicer but there IS more heat. I found that the temps rise much more quickly with the cat, starting up the bike from dead cold - by the time I had my helmet and gloves on the front head pipe was up to nearly 500F. Then I ran pretty much the same route as yesterday except I skipped riding through town on the way back as it didn't really tell me much other than its the same as to and from the freeway. So, 70mph cruise in 6th gear the front head pipe sensor shows about 750F and the one on the cat about 920F. These temps were on the outbound freeway leg, on the return freeway leg the temps seems about 25F lower, probably just a case wind direction, yesterdays test had similar variation.
I also noticed the differential between the sensors was greater on the return leg even though that had mostly lower temps at the front head pipe so it seems the cat likes to stay at a somewhat constant temperature. Going to and from the freeway seems to be 25 to 50F lower. So there you have it, without the cat the front head pipe is about 75F warmer and at the cat about 170F warmer. While I did not ride it as long as i did with a totally stock bike (intake and exhaust untouched) nor did I measure the temperature that way - I would say it does run a little cooler with the stage 1 and PV map installed. On the stock bike the heat at the RH footboard became somewhat uncomfortable after around 30 minutes. This is WITH the lowers installed and vents open, I'm going to go and remove them and run the test again to see if the figures are any different and if the perceived heat changes - seems like it would be less with the wind unrestricted.
Stock cat equipped header
Stage 1 intake
PV with canned map from Fuel Moto - fyi, the map is for no cat pipe)
SE Street Cannons
For starters it sound much nicer but there IS more heat. I found that the temps rise much more quickly with the cat, starting up the bike from dead cold - by the time I had my helmet and gloves on the front head pipe was up to nearly 500F. Then I ran pretty much the same route as yesterday except I skipped riding through town on the way back as it didn't really tell me much other than its the same as to and from the freeway. So, 70mph cruise in 6th gear the front head pipe sensor shows about 750F and the one on the cat about 920F. These temps were on the outbound freeway leg, on the return freeway leg the temps seems about 25F lower, probably just a case wind direction, yesterdays test had similar variation.
I also noticed the differential between the sensors was greater on the return leg even though that had mostly lower temps at the front head pipe so it seems the cat likes to stay at a somewhat constant temperature. Going to and from the freeway seems to be 25 to 50F lower. So there you have it, without the cat the front head pipe is about 75F warmer and at the cat about 170F warmer. While I did not ride it as long as i did with a totally stock bike (intake and exhaust untouched) nor did I measure the temperature that way - I would say it does run a little cooler with the stage 1 and PV map installed. On the stock bike the heat at the RH footboard became somewhat uncomfortable after around 30 minutes. This is WITH the lowers installed and vents open, I'm going to go and remove them and run the test again to see if the figures are any different and if the perceived heat changes - seems like it would be less with the wind unrestricted.
Thread Starter
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Ultimate HDF Member
Joined: Jun 2010
Posts: 5,105
Likes: 16
From: Blaine, WA
As far as the sound goes, it seems that with the cat installed these Street Cannons are around 3dB lower than without the cat. I will say that yesterday I hadn't fully read the instructions for the meter, there are two weighting settings, A or C. On A the reading is 89-90dB at idle, I didn't keep looking at that point since EITMS had kicked in. On the C setting the idle measures only about 78dB - maybe someone could explain the difference.
The instructions say to use A to measure the sound of an area, and use C to measure musical sound levels. I'm assuming this means A measures all sounds in the environment and C measures only sounds above ambient, I don't know which is more relevant. Nevertheless, the cat seems to knock around 3dB from the readings taken yesterday.
The instructions say to use A to measure the sound of an area, and use C to measure musical sound levels. I'm assuming this means A measures all sounds in the environment and C measures only sounds above ambient, I don't know which is more relevant. Nevertheless, the cat seems to knock around 3dB from the readings taken yesterday.
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Road Warrior
Joined: Oct 2010
Posts: 1,862
Likes: 126
From: Republic of Texas
As far as the sound goes, it seems that with the cat installed these Street Cannons are around 3dB lower than without the cat. I will say that yesterday I hadn't fully read the instructions for the meter, there are two weighting settings, A or C. On A the reading is 89-90dB at idle, I didn't keep looking at that point since EITMS had kicked in. On the C setting the idle measures only about 78dB - maybe someone could explain the difference.
The instructions say to use A to measure the sound of an area, and use C to measure musical sound levels. I'm assuming this means A measures all sounds in the environment and C measures only sounds above ambient, I don't know which is more relevant. Nevertheless, the cat seems to knock around 3dB from the readings taken yesterday.
The instructions say to use A to measure the sound of an area, and use C to measure musical sound levels. I'm assuming this means A measures all sounds in the environment and C measures only sounds above ambient, I don't know which is more relevant. Nevertheless, the cat seems to knock around 3dB from the readings taken yesterday.
Thread Starter
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Ultimate HDF Member
Joined: Jun 2010
Posts: 5,105
Likes: 16
From: Blaine, WA
I suspect the actual level of the exhaust note is lower than 90dB as I think I used the meter in such a way that it took in the ambient sound also but I don't know enough about sound measurement to say for sure. If I understand the meter correctly now, the decatted head pipe with Street Cannons should be in the range of 82dB at idle or 84dB at 3000rpm and about 101dB at 4000rpm. Regardless, I think the 3dB difference is valid and remember that a 3dB reduction is significant - if you look at this chart the perceived difference is nearly a 20% reduction which is plenty - remember that without the cat, while the Street Cannons louder than I wanted, they are still far from obnoxious, certainly not Pro-Pipe or Thunderheader loud by any means, just more than I was looking for. As it stands they are epa sound compliant even though the intake and remapping flushes the certification.