Thunderheader baffle mods???
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Road Master
Joined: Nov 2005
Posts: 826
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From: Foothills of NC
Thunderheader baffle mods???
A friend of mine said he had heard thathey was a way to mod the baffle to take out the torque dip in the the thunderheader. I did a search and come up with nothing but then i again i may not know how to search properly. Anyone know anything about this fix for the thunderheader?
Tourer
Joined: Aug 2005
Posts: 390
Likes: 16
From: Southeast
RE: Thunderheader baffle mods???
For best results it needs to be modified a little at a time between runs on a dyno.The more cam overlap the more it's going to need modifying.
Look into the end of the Thunderheader.There's 4 triangular pieces that come to a point facing into the header.The widest part of the triangle being towards the rear of the header. To increase back pressure bend the wider part of the triangle towards the outer wall of the header. Repeat this for all four sides evenly.
Look into the end of the Thunderheader.There's 4 triangular pieces that come to a point facing into the header.The widest part of the triangle being towards the rear of the header. To increase back pressure bend the wider part of the triangle towards the outer wall of the header. Repeat this for all four sides evenly.
Novice
Joined: Nov 2012
Posts: 20
Likes: 0
From: Moss Landing California
I know this is an OLDER thread but has anyone found/taken pictures of this 
mod? I recently got a Thunderheader for my 2012 Street Bob and would like to modify the baffle in the way you folks described...A few years ago I watched an '09 Yamaha RAIDER on the dyno after they'd intalled a SS SuperTrapp slip-on. They'd removed the disks and had only the END CAP to screw in (this IS not approved by SuperTrapp) As they screwed the end cap in with the motor running you could see the TORQUE curve on the monitor screen go UP. (they stopped when the curve peaked) PEACE RIDE SAFE
mod? I recently got a Thunderheader for my 2012 Street Bob and would like to modify the baffle in the way you folks described...A few years ago I watched an '09 Yamaha RAIDER on the dyno after they'd intalled a SS SuperTrapp slip-on. They'd removed the disks and had only the END CAP to screw in (this IS not approved by SuperTrapp) As they screwed the end cap in with the motor running you could see the TORQUE curve on the monitor screen go UP. (they stopped when the curve peaked) PEACE RIDE SAFE
Novice
Joined: Nov 2012
Posts: 20
Likes: 0
From: Moss Landing California
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