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thunderheader 2 into 1

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Old 02-12-2012, 12:10 PM
G Funk G Funk is offline
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Default thunderheader 2 into 1

just picked up a TH 2 into 1 dirt cheap. how much HP/TQ should i expect over RH slip-ons and big sucker?

also what setup(power commander, air cleaner, etc) would you suggest without doing any engine work? thx ahead of time

forgot it mention i have a 07 street glide. yeah i pretty much have always like TH for the sound, never cared much for the design or quality haha

Last edited by G Funk; 02-12-2012 at 12:51 PM.
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Old 02-12-2012, 12:18 PM
mkguitar mkguitar is offline
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the T/H is a great design.

louder than I like but truly a performance pipe rather than a "style".

you a$$ dyno will feel power gains over stock headers below 3000 rpms ( you'll be noticing that you may not be downshifting as much)

the best bang for buck air cleaner these days is the Ness big sucker for under $120 on ebay from easternpc, that's the chrome version if you have a black/chrome motor

tuning etc. depends on year/model/budget/how deep you want to get into it.

On my 09 I use XIEDS ( $125) plug in and done- these don't work for everyone, but the results for me have been good

you don't list what year/model you have


Last edited by mkguitar; 02-12-2012 at 12:30 PM.
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Old 02-12-2012, 12:21 PM
JCleary JCleary is offline
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Depends on what year make/model you have.

If you have an '09 49-state bike, I doubt you'll see any gains. Especially without a dyno tune. Even with a dyno tune, a Thunderheader gives you a torque dip from about 2300-2800. It's only a couple of foot-pounds, but it's there.

Top-end rush should be good. And the sound is unbeatable.

As far as tuners are concerned, either a TTS Mastertune or Dynojet Power Vision is what I would recommend. If that's too expensive, then use a Power Commander V.

XIED's do nothing for you in any throttle position that requires open-loop operation. So, essentially, anything over 3000 RPM at 75% throttle or more, or over 4000rpm at any throttle position. When you're exposing your engine to the highest loads, your engine is required to use mapping designed for a stock air cleaner and exhaust.

I just opened my map for my bagger, and took the data right from it.
Do what you want, but it's not something I would want to do to my bike.

At least with a PCV, PV, or TTS you're using a map that's close to ideal. And, with the TTS and PV you can actually tune the bike yourself.

I run Thunderheaders on both my Harleys.

Last edited by JCleary; 02-12-2012 at 12:29 PM.
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Old 02-12-2012, 12:27 PM
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pittz5 pittz5 is offline
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they really need a good tune and where I am I have gotten best results with a TTS. On my new to me RKC I am running the PC5 and I really liked the tune better with the TTS on my 09 RG. NOTHING sounds like the TH and I have tried everything. I tried the Fatcat Boss most recently and hated the sound so I went back to the TH. Quality may not be as good but damn it sounds good. On my 05 RG i replaced Rinehart TD with the TH and it was night and day above 3000rpm. This is my experience only so keep that in mind..;-)
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Old 02-12-2012, 03:58 PM
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TWIN CAM 96 TWIN CAM 96 is offline
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Thunder Headers are one of the best for HP's/Torque you should get at least 4-7 on each.
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2007, air, bike, chart, cleaner, dyno, eagle, glide, harley, intake, running, screaming, street, thunderheader, torque, tune, tuning

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