Fullsac MX Header pipe
Advanced
Joined: May 2012
Posts: 72
Likes: 7
From: Ohio
We need an update on the header install. I'm debating on ordering the MX and having it thrown on with a dyno run at the 1K service.
How do you like this setup? Did Steve wrap the baffles when he recored your OEM mufflers? I just bought a 2018 RGS and ordered the Fullsac MX header along with the 2.0" OEM recore kit and I'm curios on the sound of the bike. Going to be a week or so before the parts are in so I'm anxiously waiting trying to find sound clips of this setup.
Seasoned HDF Member
Joined: Nov 2016
Posts: 6,088
Likes: 6,446
From: East TN
Dave, just traded my 09 CVO Road Glide for a 18 CVO Road Glide.......did you have Fullsac redo your stock mufflers and used them or did you go with different slip ons? I had the V&H power duals and OS 4.5 slips ons on my 09, sounded great, good numbers on the dyno on the 09, 94HP and 112TQ with the SE race tuner. I was leaning towards the V&H power duals again and S&S MK45's. Thanks
On the 110, my 09 I originally had V&H exhaust, but a tuner showed my I picked up 4 torque and 3 HP with the Fullsac system. Been running fullsac since. Even on my build 13 CVO King, I'm at 138.5 HP and 140 torque with Fullsac.
I do hear the MK 45's are better than the High outputs I had on my 09.
Road Captain
Joined: Dec 2016
Posts: 589
Likes: 49
From: Whitehall, MI
I'm running the fullsac mx header with the 2.0" OEM Recores and it's awesome! The torque is there right away. It pulls from a stop so much easier now. Still trying to determine if I like the sound of the OEM mufflers with the 2.0" recores from fullsac. Sounds a lot better then stock and I'll leave alone this year. The head pipe is quality! Worth the money!
I'm running the fullsac mx header with the 2.0" OEM Recores and it's awesome! The torque is there right away. It pulls from a stop so much easier now. Still trying to determine if I like the sound of the OEM mufflers with the 2.0" recores from fullsac. Sounds a lot better then stock and I'll leave alone this year. The head pipe is quality! Worth the money!
Tourer
Joined: Apr 2013
Posts: 432
Likes: 63
From: Savage
I have a question about the crossover mounting. Is the crossover mounted using two bolts from the oil pan? I had and S&S setup that used four bolts from the pan to mount the bracket and all of the bolts broke. Is that a petentioal issue with this header?
Road Master
Joined: Jul 2005
Posts: 1,118
Likes: 26
From: OOB, Maine
I'm running the fullsac mx header with the 2.0" OEM Recores and it's awesome! The torque is there right away. It pulls from a stop so much easier now. Still trying to determine if I like the sound of the OEM mufflers with the 2.0" recores from fullsac. Sounds a lot better then stock and I'll leave alone this year. The head pipe is quality! Worth the money!
Did you tune the bike with anything, or is it stock with that pipe on it and that's all. Stock air cleaner?
Adam
From what I can tell from the photos on the Fullsac website, there is no mount on the X-pipe crossover for the M8 models. The earlier TwinCam X-pipe has a mount just like the stock mount it appears.
Big Kahuna HDF Member
Joined: Oct 2010
Posts: 51,364
Likes: 4,614
From: Texas
Using a stock headpipe with cat removed
Last edited by Hairy Larry; Dec 30, 2020 at 10:43 AM.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
I thought the same thing about removing the cat from the stock headpipe until I watched this video of a stage 3 upgrade using a Red Shift 468. There is a pronounced dip in torque early on due this headpipe.
https://www.youtube.com/watch?v=YEek-D2WhzM&t=402s
https://www.youtube.com/watch?v=YEek-D2WhzM&t=402s
Here is my bike with a decatted head pipe with the RS468. It has the stock muffler cans with Fullsac 2" cores. The mufflers do make a difference.
As you can see it made good torque and it made it early without a dip. I'm not saying the stock header decatted is the best pipe to use on a stage III, but from the torque and hp they made with is it doesn't look bad. Some mufflers with a little more back pressure would move the torque curve to the left and should get rid of the dip.
When Steve Cole and I were testing cams he had the TTS150 cam in his M8 107 with the Fullsac X pipe and his torque curve came up very quickly compared to mine with the same cam. So a good aftermarket pipe can make a difference, but the stock pipe is pretty well designed. Again, the mufflers make a lot of difference also.
Thread
Thread Starter
Forum
Replies
Last Post
04ctd
Tri Glide, RG3 & Freewheeler Models
2
May 17, 2019 04:49 PM