Help Identifying Exhaust
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3.3195" ID, 3.4625" OD
The Best of Harley-Davidson for Lifelong Riders
We've had many customers remove their baffles from various types of exhaust and put these in place simply for the gain in low and mid range torque, which is achieved by the TTIs even with stock exhaust.
Check out this Dyno:

Not only do you get a gain in performance, they really deepen the tone of your exhaust, giving it a throatier growl. Gives a pretty badass sound.
They are completely adjustable as well, so that you can work with them until you hit your "sweet spot", getting the sound and tone you're looking for.
Check out this video:
Since I don't know what exhaust you have, I can't say exactly what size you'd need. But I can tell you this...
If the inside diameter is anything less than 3", you'll want to go with the 158 TTIs. If it's 3" or larger, then you would go with the 258.
The idea to use the largest inserts that will fit into your exhaust for the most optimal results in performance as well as sound.
They are really one of the most satisfying mods you can do to your bike because the results are exponential for a relatively low cost product, $30.
Here is a LINK to our Thunder Torque Inserts.
Cristy
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