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If you do not have 18mm ports already built in to your head pipe, youWILL have to have it drilled and tapped to accept the 18mm O2 sensors. The main selling point of the Thundermax, is the ability to adapt to wider parameters via., wide band O2 sensors. There are no adapters, and you’d be foolish to try.
I found a nice set of Vance & Hines headers for an '09 FLHX. They have the correct size hole for the 18mm 02 sensors. I'm just wondering if they'll interfere with anything on my 2013 FLHX?
Thanks
Just saw this. No, they won’t interfere. Just plug up the 12mm ports
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