Doesanyone make a fullsized cross over for the stock exhaust system? - Road Glide Forums
Intake and Exhaust Intake and Exhaust Systems for Road Glides

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post #1 of 14 (permalink) Old 03-20-2019, 01:11 AM Thread Starter
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Does anyone make a fullsized cross over for the stock exhaust system?

I checked Fullsac, Fuel Moto and a couple others and I don't see anyone who makes a full sized crossover for the stock exhaust system. Do any of you RG.org wizards know of anyone who makes one?

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post #2 of 14 (permalink) Old 03-20-2019, 02:56 AM
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Here's the Fuel Moto crossover. says it's for 09 and up stock headpipes.

https://www.fuelmotousa.com/series-1...-over-kit.html


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post #3 of 14 (permalink) Old 03-20-2019, 07:02 AM
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Originally Posted by yzernie View Post
I checked Fullsac, Fuel Moto and a couple others and I don't see anyone who makes a full sized crossover for the stock exhaust system. Do any of you RG.org wizards know of anyone who makes one?
What is your goal by doing this? Do you have evidence that it will actually perform better? The way the stock exhaust is from the factory actually performs closer to a 2into1 so I wouldn't see a need to change it. If I wanted a change I would go to a different header that would get me what I wanted in the performance department matched to the cam I was using.

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Here's the Fuel Moto crossover. says it's for 09 and up stock headpipes.

https://www.fuelmotousa.com/series-1...-over-kit.html
If you try and put in the year model for the bike under the listing for that crossover it will only go up to 2016. The M8 exhaust is far different than the TC was so I'm pretty certain this will not work on an M8.
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post #4 of 14 (permalink) Old 03-20-2019, 01:25 PM Thread Starter
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What is your goal by doing this? Do you have evidence that it will actually perform better? The way the stock exhaust is from the factory actually performs closer to a 2into1 so I wouldn't see a need to change it. If I wanted a change I would go to a different header that would get me what I wanted in the performance department matched to the cam I was using.
I'm simply asking a question. As far as performance increase...I don't know. I do know it would give the bike a more equal flow out of each muffler and a better dual muffler sound. Maybe I'm just to used to the TC sound with the full sized crossover. The M8 is a whole new ball game for me.

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post #5 of 14 (permalink) Old 03-20-2019, 01:45 PM
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I'm simply asking a question. As far as performance increase...I don't know. I do know it would give the bike a more equal flow out of each muffler and a better dual muffler sound. Maybe I'm just to used to the TC sound with the full sized crossover. The M8 is a whole new ball game for me.
Engineers spend a lot of time designing exhaust systems so when we take it upon ourselves to start tinkering and changing baffles or changing the size of crossover pipes we sometimes defeat the whole purpose and start diminishing things instead of enhancing them. If you are still running the stock cam I wouldn't change a thing. If a very qualified engine builder/tuner told you that going to a full sized crossover in combination with a certain cam, headwork, and a good tune would get you the results you are looking for then yes I might buy changing it. Maybe @Thermodyne , or someone with more knowledge than me, will chime in and give his thoughts as I could be completely wrong and opening up the crossover could yield better performance.

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post #6 of 14 (permalink) Old 03-20-2019, 02:57 PM
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If you try and put in the year model for the bike under the listing for that crossover it will only go up to 2016. The M8 exhaust is far different than the TC was so I'm pretty certain this will not work on an M8.
I didn't see where his bike was a 17 or later. I know theres a difference. just assumed he was asking about the TC. The wait the M8 exhaust is designed I'm not sure why youd want to up the crossover size. Unless you went to an aftermarket headpipe. But that's from my very limited knowledge of the M8.
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post #7 of 14 (permalink) Old 03-20-2019, 04:27 PM
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Full size cross over for the M8 head pipe? Doubt it would do anything, the way that pipe is plumbed in, its going to resist flowing.

If you put a jackpot pipe on it, then I'm pretty sure there is a full sized cross over for it. There is for the TC.
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post #8 of 14 (permalink) Old 03-20-2019, 05:48 PM Thread Starter
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Engineers spend a lot of time designing exhaust systems so when we take it upon ourselves to start tinkering and changing baffles or changing the size of crossover pipes we sometimes defeat the whole purpose and start diminishing things instead of enhancing them. If you are still running the stock cam I wouldn't change a thing. If a very qualified engine builder/tuner told you that going to a full sized crossover in combination with a certain cam, headwork, and a good tune would get you the results you are looking for then yes I might buy changing it. Maybe @Thermodyne , or someone with more knowledge than me, will chime in and give his thoughts as I could be completely wrong and opening up the crossover could yield better performance.
Since inflection cannot be seen on written matter I say the following without any attitude...I apologize that my questions may seem elementary to you. The M8 is a totally different animal for me and I'm just trying to gain some additional knowledge of this engine intake and exhaust vs the TCs I've had for the last several years.


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Full size cross over for the M8 head pipe? Doubt it would do anything, the way that pipe is plumbed in, its going to resist flowing.

If you put a jackpot pipe on it, then I'm pretty sure there is a full sized cross over for it. There is for the TC.
Makes sense. Based on what you are saying, since there is such a huge outlet for the right side muffler and so little flow out of the left side muff what is your opinion on blocking off the left side completely (with the stock headpipe and aftermarket slip ons)?

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post #9 of 14 (permalink) Old 03-20-2019, 07:19 PM
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Originally Posted by yzernie View Post
Since inflection cannot be seen on written matter I say the following without any attitude...I apologize that my questions may seem elementary to you. The M8 is a totally different animal for me and I'm just trying to gain some additional knowledge of this engine intake and exhaust vs the TCs I've had for the last several years.
Your question wasn't elementary to me at all. I was just trying to grasp what your goal was and I may assumed that you were just wanting to change the crossover because you didn't like the look. Sorry if I came across in a way that made you feel disrespected. Wasn't my intention and in all reality the M8 is not that different than the TC. They could have put the same pipe, or a variation of, on a TC.

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post #10 of 14 (permalink) Old 03-20-2019, 07:51 PM
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I'm simply asking a question. As far as performance increase...I don't know. I do know it would give the bike a more equal flow out of each muffler and a better dual muffler sound. Maybe I'm just to used to the TC sound with the full sized crossover. The M8 is a whole new ball game for me.
On a true dual, loved the sound, did NOT like the power drop off....I was running V & H true duals on my previous 2 twin cam motors. I loved the sound but low end grunt/ torque fell off significantly. Again, sound was great but the power drop, not so much. I'm not sure if a larger cross over pipe will give the same affect but it will reduce back pressure that helps in power development if I understand it correctly.
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