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I have a 2019 117 CVO, I'm planning a small upgrade, a/c, cam, pipes and brain. Does anyone have direct experiance with Thunderheader 2:1 with that or a similar set up?
Last edited by red shift; Apr 20, 2021 at 12:31 PM.
Reason: update question
I should add: I apprciate that they are poorly made and a terrible quality (in black at least) but I've had them on Evo's and TC's since 96 and love the performance. How do they perform on the M8 mill?
I don’t have it on an M8, but absolutely love it on my ‘07 Bagger. From my experience the black version of the pipe doesn’t last (fades, chips, etc). In my opinion the sound is pure awesome and aggressive soon as you hit the throttle and mean when cruising around.
DYNAKID94 just posted the below pic of his M8 Road King with a black TH pipe in the performance bagger thread
So mine is actually just the right side slip on with the factory headpipe and the crossover port plugged. Been really happy with the sound but couldn't tell you performance increase over stock since it already had RCX slipons when I got the bike. Planning on having someone fab up something custom for me down the road - a "shorty" thunderheader if you will - using a gutted headpipe and the slip on.
Thanks for the pic, that looks pretty slick. I'm keen to see the numbers, is the motor otherwise stock?
Bought it used in 2019 with a SE Stage 3 114 kit and tuner already installed, I changed the slip on and the air cleaner. Haven't had it dyno'd but it's definitely quicker than stock lol. Pulls the front wheel up no problem, and sounds healthy...
I just had mine installed last week, however, my Electra Glide is a 96" Twin Cam so I can't give any M8 feeback. I've run Thunderheaders on all my bikes and have never had any issues.
In addition to the exhaust, I'm running a Screamin' Eagle stage-1 air cleaner kit with a K&N filter and the air/fuel system has been mapped with DynoJet Power Vision tuner.
I don't have 2-1 but I have slip ons (pre M8 style) mated to S&S header with A/C and fuel moto powervision tune only and have zero complaints with the power curve. aside from that stock 107
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Thunderheader
