Modified Thunder Headers
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Tourer
Joined: Jan 2009
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From: I'm nation wide
Modified Thunder Headers
I was looking at a couple of old posts, came across a comment about modifying a Thunder Header. What are the pros and cons? How is it done? After it's done, does the mod cause a re-tune (DYNO)? last but not least is it worth the time and effort?
Elite HDF Member
Joined: Mar 2006
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From: Biddeford, Maine
It's a simple mod that doesn't require any AFR tuning after it's done.
What you are modifying is the rear most part of the baffle. If you look into the muffler from the rear, you will see a square made out of metal. What you do is take a long socket extension or steel bar and bend 3 of the 4 sides of that square out towards the round sides until it is about 1/8" away. What that will do is create a bit more back pressure and take care of the low-end torque dip the TH is known to have.
I did it to both of my TH exhausts when I had them, and to a couple of friends as well.
Steve
What you are modifying is the rear most part of the baffle. If you look into the muffler from the rear, you will see a square made out of metal. What you do is take a long socket extension or steel bar and bend 3 of the 4 sides of that square out towards the round sides until it is about 1/8" away. What that will do is create a bit more back pressure and take care of the low-end torque dip the TH is known to have.
I did it to both of my TH exhausts when I had them, and to a couple of friends as well.
Steve
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