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My headers arrived unscathed! Mr. Squiggle did a very thorough job of packing, and he even threw in all the hardware, gaskets, and aluminum Sebspeed center stand stop that he had collected for the header! 😆 Due to the fact that now is coming into some of our best riding here (cool mornings/evenings, warm afternoons, mountain roads open and clear, many days still sunny) and due to a lot of my spare funds currently going to my Suzuki Cappuccino restoration project, I will probably install these and work on a tuning solution sometime this winter. Here's a few photos of the big sturdy box, and the headers out of the box on the kitchen floor. And before someone asks, yes, that is a dirt bike wheel in the front entry of my place. 😜

You could always add them. Adding O2 sensor bungs aren't foreign to most welding/exhaust shops. I added one per cylinder ~4-5 inches downstream from each exhaust port on my WiLD set. Made adjusting AFR's a lot more predictable for my guy.

I would be seriously interested in a VFRD 8th gen header, missed out on all this forum talk, wish I would have paid more attention earlier the last year and a half, but I couldn’t figure out the email to confirm my account. 😭

Here's a shot of the MTB installation instructions. Note that it says to retain the stock O2s and cautions that it may not work correctly without them. It seems to imply that the Racing module needs that input regardless of whether a MTB is installed or not. Seems like they could develop a Racing module that could read a wideband sensor directly.