Performance changes after removal of M8 Catalytic Converter - Road Glide Forums
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post #1 of 11 (permalink) Old 02-13-2019, 10:45 AM Thread Starter
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Performance changes after removal of M8 Catalytic Converter

I have a 2017 RGU with Stage II Torque Cam and am thinking of removing my catalytic converter. I just wondering what experience others have had after removal. Performance? Sound?
Thank You;
Bill

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post #2 of 11 (permalink) Old 02-13-2019, 10:56 AM
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Just sound


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post #3 of 11 (permalink) Old 02-13-2019, 11:41 AM
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Mainly less heat performance difference is nil


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post #4 of 11 (permalink) Old 02-14-2019, 11:22 PM
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Mainly less heat performance difference is nil
Just seen another member comment that when they tested it with the cat removed, the only thing that flows better is a D&D.

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post #5 of 11 (permalink) Old 02-15-2019, 09:53 PM
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The M8 cat has been shown to flow exceptionally well and there is virtually no performance gain between an aftermarket header and the stock header with cat. The gain is in the level of sound produced and a reduction of heat. If you want more sound or reduced heat, gut the cat. Save your coin and avoid buying an aftermarket header. You can gut the cat on the bike through the enlarged rear right side opening without cutting a window and rewelding.
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post #6 of 11 (permalink) Old 02-15-2019, 10:36 PM
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You already have stage 2 so probably nothing in performance but your passenger will thank you.
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post #7 of 11 (permalink) Old 02-16-2019, 08:13 AM
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On an otherwise stock ‘19 114:
Gutted mine mainly to reduce heat... it worked beautifully.
This is very subjective, but it did end up a “bit” louder to my ears, however G/F says it’s no different......
It did drastically improve off idle response, mainly when 2 up, with no adverse effects any where else.

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post #8 of 11 (permalink) Old 02-17-2019, 05:46 AM
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You can gut the cat on the bike through the enlarged rear right side opening without cutting a window and rewelding.
Looking to do this, how did you remove the cat through the opening without cutting a window?

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post #9 of 11 (permalink) Old 02-17-2019, 08:25 AM
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Looking to do this, how did you remove the cat through the opening without cutting a window?
The outlet on the right side is large enough. Use a long drill bit and drill through around the cat material. You can then break it up and pull out the rear of the header.
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post #10 of 11 (permalink) Old 02-17-2019, 11:28 AM Thread Starter
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Looking to do this, how did you remove the cat through the opening without cutting a window?
After researching cat removal on M8's I am going to use a 15/8 inch deep metal hole saw on a mandrel, and a 1.5 inch paddle bit to get the sides. A magnet and vac to clean out the mess. I'll block off the cross over pipe to keep out the debris. A friend of mine got about half way through drilling his cat out and the whole cat became detached from the pipe. He broke it up and removed it with the pipe being clean other than some type of mastic. I'm thinking I'll either video the process when I do it or at least a lot of photos.
Bill
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2017 Road Glide Ultra, Black Hills Gold and Quartz Black, purchased Jan 6th, 2018
2012 Goldwing California Side Car Trike Ky Wildcat Blue, for when Kathy wants to ride.
2013 Ultra Limited, Rear ended and totaled while riding Jelico Mountain, 06-09-17, RIP.

Last edited by paid4c4; 02-18-2019 at 09:51 AM.
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