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Intake and Exhaust Intake and Exhaust Systems for Road Glides

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post #1 of 34 (permalink) Old 01-23-2019, 04:41 PM Thread Starter
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Question loud not needed

I know this is a little outside of the box when it comes to HD exhaust. Seems like most HD guys love the super loud pipes. I have no problem with anyone that wants that. To each his own. But, I've been there (done that). My last bike had D&D performance pipes that were pretty loud (not the loudest, but they were loud).

Anyway... my point is, I don't care about loudness anymore. My first priority is performance when it comes to swapping out HD pipes/headers. If I have any desire for a change in sound, it would be to just have a nice, low-tone growl without any significant increase in decibels...

Anyway, does anyone have any suggestions on pipes that primarily improve performance, but aren't going to compete with my stereo for volume?
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post #2 of 34 (permalink) Old 01-23-2019, 05:14 PM
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Originally Posted by Prolific View Post
I know this is a little outside of the box when it comes to HD exhaust. Seems like most HD guys love the super loud pipes. I have no problem with anyone that wants that. To each his own. But, I've been there (done that). My last bike had D&D performance pipes that were pretty loud (not the loudest, but they were loud).

Anyway... my point is, I don't care about loudness anymore. My first priority is performance when it comes to swapping out HD pipes/headers. If I have any desire for a change in sound, it would be to just have a nice, low-tone growl without any significant increase in decibels...

Anyway, does anyone have any suggestions on pipes that primarily improve performance, but aren't going to compete with my stereo for volume?
I have to say that the SE performance exhaust system with the Street Cannon mufflers are exactly what you are describing. The system is not cheap from the dealer but I picked mine up from a friend that wanted the D&D setup and I am actually loving them. The sound at idle is not much more than the stock but when you roll on the throttle it has a nice grunt. The sound at a nice cruising speed on the highway is a nice mellow tone that doesn't wear you out. I also ran the D&D on my last two bikes and there are times where I miss that sound but there are also times when I love what I have because I can hear the stereo much easier and my ears aren't ringing when I get home from a long ride. My good friend who is the long time performance guy at the local dealer tried to talk me out of putting them on my bike because he thought I would want louder. His words were "They make great numbers on the dyno but they just don't have enough sound." He is also a big D&D guy though. I like them also because they put the CAT in the mufflers so you don't get as much heat from the pipe on your right foot/leg. I am about to do the stage II power cam and I am considering drilling out the cats in the mufflers so they are a little cooler and it might add a little more volume. Hope this helps.
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post #3 of 34 (permalink) Old 01-23-2019, 05:17 PM
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Here is a link to what they cost through Surdyke HD. HornyToad May have a better price so you could check with Reggie there.

https://www.surdyke.com/PartsMain.as...%20–%20Touring

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post #4 of 34 (permalink) Old 01-23-2019, 05:22 PM
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I like them also because they put the CAT in the mufflers so you don't get as much heat from the pipe on your right foot/leg..
Interesting - I had no idea the MoCo offered something like this - Safe to assume your warranty is intact as well with there still being an "HD Approved CAT" somewhere in the equation?

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post #5 of 34 (permalink) Old 01-23-2019, 05:35 PM
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I did the HD Street Cannons, HD stage 1 with HD tuner. I like the sound, more than stock with a nice sound when working the throttle. When just cruising, nice volume, not too quite not too loud. For me, the tune did a nice job of waking up a bit more performance. For me, the fact that it does not impact to warranty is a plus.

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post #6 of 34 (permalink) Old 01-23-2019, 05:50 PM
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Interesting - I had no idea the MoCo offered something like this - Safe to assume your warranty is intact as well with there still being an "HD Approved CAT" somewhere in the equation?


That's it exactly. It is a true x-pipe (2-1-2) and has great performance to it. It's just not popular because it's an HD pipe and it's not as loud as most people want. Plus with this headpipe you can only run the Syreet Cannons that come with it as the pipes at the mufflers are a different size than what comes on the M8. It really looks like the same as the TC exhaust but I haven't confirmed that it is and that they will fit. I will research it more though.

Now if I do remove the CATS on my own there is a small chance that it could cause me some warranty issues but I don't think my tech would look up the tailpipe to see if they are there. They will just see that I have the HD SE exhaust system.


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post #7 of 34 (permalink) Old 01-23-2019, 06:06 PM
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Now if I do remove the CATS on my own there is a small chance that it could cause me some warranty issues but I don't think my tech would look up the tailpipe to see if they are there. They will just see that I have the HD SE exhaust system.
I would also be a tad concerned about what that lack of back pressure may do to the tune.......as I don't know how "adjustable" per say the Street Tuner is - From what I have been told, it is Plug and Play Maps as blessed by the Mother Ship with some VERY slight variances for mixtures. Guess though if it does goof things up, Used Street Cannons can be found for cheap

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post #8 of 34 (permalink) Old 01-23-2019, 06:31 PM
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I would also be a tad concerned about what that lack of back pressure may do to the tune.......as I don't know how "adjustable" per say the Street Tuner is - From what I have been told, it is Plug and Play Maps as blessed by the Mother Ship with some VERY slight variances for mixtures. Guess though if it does goof things up, Used Street Cannons can be found for cheap
I used to think that removing the CAT would change the back pressure therefore making it necessary to retune the bike but after numerous discussions with people who know I've learned that the CATS do not affect the backpressure like most would think so it will not affect the tune. The benefit of removing them is to help improve the sound a bit and of course it will be cooler without them.
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post #9 of 34 (permalink) Old 01-23-2019, 10:59 PM Thread Starter
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I have to say that the SE performance exhaust system with the Street Cannon mufflers are exactly what you are describing. The system is not cheap from the dealer but I picked mine up from a friend that wanted the D&D setup and I am actually loving them. The sound at idle is not much more than the stock but when you roll on the throttle it has a nice grunt. The sound at a nice cruising speed on the highway is a nice mellow tone that doesn't wear you out. I also ran the D&D on my last two bikes and there are times where I miss that sound but there are also times when I love what I have because I can hear the stereo much easier and my ears aren't ringing when I get home from a long ride. My good friend who is the long time performance guy at the local dealer tried to talk me out of putting them on my bike because he thought I would want louder. His words were "They make great numbers on the dyno but they just don't have enough sound." He is also a big D&D guy though. I like them also because they put the CAT in the mufflers so you don't get as much heat from the pipe on your right foot/leg. I am about to do the stage II power cam and I am considering drilling out the cats in the mufflers so they are a little cooler and it might add a little more volume. Hope this helps.
That's interesting. I steered clear of the regular street cannons because I couldn't tell the difference in sound (heard them both at the dealership) and wasn't going to pay $500 for a couple extra horses. But now that I have Stage 2 with the auto-tuner, the high-flow may be the way to go. Especially since my warranty will remain in tact and you have some real world experience with them. I'll keep doing a little research this next week, but I'm leaning that way, big time now.
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post #10 of 34 (permalink) Old 01-24-2019, 08:34 AM
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I used to think that removing the CAT would change the back pressure therefore making it necessary to retune the bike but after numerous discussions with people who know I've learned that the CATS do not affect the backpressure like most would think so it will not affect the tune. The benefit of removing them is to help improve the sound a bit and of course it will be cooler without them.
Good to know....

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