So I sat and read most of this thread, and gathered that some are still confused. Any unit other than the SERT, (Although Hoist says its a warranty killer) will trick the factory ecm into thinking it has enough fuel.
There is actually nothing wrong with this, but the whole idea of having sensors is to make sure that there will be enough fuel, (in the case of Harley), only in cruise.
If you remove the sensors, you now have an additional unit, like the Dyna for example, that you must totally rely on, with only a dyno run to make sure your settings are ok.
If that unit fails, it will revert back to the factory ecm, and with mods, run the risk of burning up your motor, becasue even WITH the factory narrow band sensors, they only make less than 5% adjustment either side of stock. Not nealry enough for keeping up with more air from an opened up intake.
Either way, I still think any mods must be protected, and the SERT is the closest thing to it. The module, which gets married to your bike, will guarantee that you have changed the factory ECM per the Harley Map designed to work with aftermarket setups. Harley has a list of these. And to be sure, Dyno it with a KNOWLEDGABLE person to modify even what Harley map gives you. (After the mods I did, the new SERT Harley map still ran at 15.1.) way to lean in my book.
Yes you must pay.
ANY other device, I personally think is risky, except one, the TMAX. It's a brand new total ECM replacement. Now you have a wide band sensor installed, that CONSTANTLY monitors, and CHANGES your AFR to the ratios you have selected, whcih aint gonna be north of 14.1 in any case.
If you are nervous, and have warranty phobia, just swap out the new TMAX back for the facotry ECM, and roll into the dealership. But that is way major extra insurance, not a budget issue, this type of phobia insurance.
Of course, you can also use the twin tec to double check and MONITOR stuff, but I think that is not neccessary at all.
Be one with the bike. Give her what she wants. Know what she needs. She wants more fuel and she want to be cool. Make it so.
Rhino