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S1owner
| Posted on Monday, April 21, 2014 - 07:33 am: |
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Anyone know any info on these? Thunder header?
![](http://i1148.photobucket.com/albums/o578/s1owner/2FC2DB7B-A295-4D30-9FB5-E18085E4C00D_zpsegsqkeeh.png) |
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Phelan
| Posted on Monday, April 21, 2014 - 11:05 am: |
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Looks homemade to me. Though I have heard of people putting Thunderheader megaphones on tubers. I think Thunderheaders have a one-piece reverse cone though. I could be wrong. |
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S1owner
| Posted on Monday, April 21, 2014 - 01:48 pm: |
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Not homemade they were manufactured |
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Firemanjim
| Posted on Monday, April 21, 2014 - 04:43 pm: |
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Tuning nightmare on HD's, sure would not want one on a Buell I owned---- |
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S1owner
| Posted on Monday, April 21, 2014 - 10:26 pm: |
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Thats what I needed to know Jim thanks. Heard they are hellaciously loud also. |
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Sportyeric
| Posted on Tuesday, April 22, 2014 - 10:58 am: |
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I'm out of my mind to contradict FMJ, but I had read that the Thunderheader was the best performing exhaust for a Sportster in the mid-90s. Poor cornering clearance on the Sporty so I ditched mine. Had a lovely note but loud enough to set off car alarms at half throttle and 4K rpm. |
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Essmjay
| Posted on Tuesday, April 22, 2014 - 11:10 am: |
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I had Thunderheader pipes on my ElectraGlide. The motor had a lot of performance mods and ran great. But the exhaust was extremely loud. (Message edited by essmjay on April 22, 2014) |
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Buellistic
| Posted on Tuesday, April 22, 2014 - 11:35 am: |
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Looks like a "RPM" pipe for a TWO-STROKE !!! |
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Sportyeric
| Posted on Tuesday, April 22, 2014 - 01:46 pm: |
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Au contraire. The gap underneath the rear hanger in that pic created an "anti-reversion" by sending a pulse back up the pipe from there, instead of from the end of the pipe, which smoothed out the mid-range. Something like that. It was 20 years ago that I read the article. |
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Jack_fe
| Posted on Tuesday, April 22, 2014 - 09:47 pm: |
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I have a thunderheader on my '93 sportster, makes the V&H on the S-3 sound muted by comparison. wonderful "hooligan" pipe - no problem tuning CV - |
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Screamer
| Posted on Wednesday, April 23, 2014 - 07:41 am: |
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I had a thunder header muffler on a Buell race header (S2). I don't think I ever dyno'd that combination, but for about six months we lived in a housing development and it was just too loud for that environment... |
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Firemanjim
| Posted on Friday, April 25, 2014 - 01:46 am: |
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They have a big hole in the middle of rpm range, hard to tune it out even with an injected bike. On a dyno run we would hold a 2x4 over the muffler til bike was through the "hole" to show the owner. Way better pipes out there for Buells and HD's. |