Thunderheader Slip Ons
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Joined: Jul 2017
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From: Todd NC
Thunderheader Slip Ons
Looking to see if anyone is running Thunderheader slip ons on their M8? I recently picked up a 2020 Road King Special and looking at adding either Thunderheader Slip Ons or some S&S Grand National. I'll be sticking with the 4 inch mufflers this time for the backpressure and clearance for the twisties. Thanks
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Joined: Jul 2017
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From: Todd NC
Thanks for the video and reply. Most of the younger guys don't know the history of the Thunderheaders and they do sound great. Did you go with their heat shields or stick with stock? This will probably be a winter time swap since right now I've been on TLOW from GE Aviation for the past 6 weeks due to the COVID really knocking the aviation industry. Thanks
Road Master
Joined: Mar 2017
Posts: 760
Likes: 273
From: Olympia, WA
Thanks for the video and reply. Most of the younger guys don't know the history of the Thunderheaders and they do sound great. Did you go with their heat shields or stick with stock? This will probably be a winter time swap since right now I've been on TLOW from GE Aviation for the past 6 weeks due to the COVID really knocking the aviation industry. Thanks
Seasoned HDF Member
Joined: Sep 2009
Posts: 17,143
Likes: 6,165
From: SE Michigan
Looking to see if anyone is running Thunderheader slip ons on their M8? I recently picked up a 2020 Road King Special and looking at adding either Thunderheader Slip Ons or some S&S Grand National. I'll be sticking with the 4 inch mufflers this time for the backpressure and clearance for the twisties. Thanks
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Joined: Jul 2017
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From: Todd NC
I'll stick with the 4 inch slip ons since I mentioned the M8's like the backpressure. I ran my MK 45's with the db killers and out and definitely could tell the difference on roll on acceleration. I may also look into the thundermonster baffles as well since I have quite a few friends back in NH and NY that use them and great numbers on the dyno.
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Road Captain
Joined: Jun 2017
Posts: 667
Likes: 175
From: North Port Florida
I had TH's on my old '05 road glide with a stage 3! Sweet sound!
Dont see the TH's around much any more.
Dont see the TH's around much any more.
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Ultimate HDF Member
Joined: Oct 2016
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From: On my bike!
When I was playing musical exhaust this was the deal breaker for me on thunder header.
Last edited by Quik; Aug 2, 2020 at 06:29 AM.
Ultimate HDF Member
Joined: Oct 2016
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From: On my bike!
I'll stick with the 4 inch slip ons since I mentioned the M8's like the backpressure. I ran my MK 45's with the db killers and out and definitely could tell the difference on roll on acceleration. I may also look into the thundermonster baffles as well since I have quite a few friends back in NH and NY that use them and great numbers on the dyno.
Last edited by Quik; Aug 2, 2020 at 06:28 AM.