I havethe SERT on my 08 FLHTCU and a DTT/WEGO IID on my 07 FLHX.
The SERT was used because nothing else was available. It works great, but you can`t use it on any other bike. If you modify the bike and no matching map is available you will need to pay for dyno tuning. That is if you can find someone competent to do the job.
I like the DTT/WEGO IID because it replaces the factory ECM. This will allow me to return the bike back to stock with no trace. No need for dyno tuning either.
The DTT/WEGO IID setup works great. I bought the RH-TD`s and SE-A/C and tuned it to match that setup. Bike ran great and I spanked a 95 kit with it.
Then I added my RedShift 575 cams. Now I`m tuning to it. Later when I add my 117 kit I will tune to that setup as well.
IMO the DTT/WEGO IID or similar tunerwill bethe best purchase because it will adapt to the changes down the road without the need for aDyno.
The biggest bonus on the FLHXwas no more heat issue`s.
