Originally Posted by iclick

This is correct. The ECM functions that you have with a flash tuner (PV, TTS, SEPST, etc.) are also functional with a PCV, FM Micro, or whatever. The big difference is that you have no access to ECM tables and thus can't change or influence most of them with the "piggyback" devices. These PC-related tuners (FM Micro, PCIII, PCV) simply add or subtract fuel downstream of the ECM, and the ECM has no knowledge that added device is even in the mix, so there is no "tricking the ECM" taking place. These tuners will simply modify the signal downstream of the ECM.

The Micro Tuner is new, has reduced functionality compared to a PCV with the tradeoff of a lower price, and does not allow adjustment of spark advance. These "piggyback" tuners work fine for most riders whether in a new or older EFI bike, but if you have any aspirations of making further changes to your configuration (cams, etc.) you should consider a tuner that will allow spark-advance changes, like the PCV, PV, etc.

FWIW, I've run the PCIII, PCV, PCV-AT, and now the PV in my bike and each of these tuners has provided a good tune. I couldn't say that each step up caused the bike to run any better overall than the last, but I do like the features on the PV, most of them quite esoteric, for doing things you can't do with any piggyback device. These flash-based tuners do indeed provide more flexibility in your tuning experience, so if you have an unnatural craving to tweak your tune to extreme levels of detail I would recommend the PV for its ability to access ECM tables. It will also allow datalogging without tethering a running laptop computer to the bike while riding. The display unit will receive datalog info as well as display parameters from the ECM and calculated values from the PV (e.g. gas mileage, fuel used, Lambda from optional wideband O2 sensors, etc.). If you crave information while you're riding you will be in hog heaven with the PV. Other flash-based tuners work in a similar way, but the difference is the display unit, which IMO is a big advantage over the competition.

OTOH if you only want to position AFRs at a point that will make the bike run optimally the PC tuners, including the Micro, will do the trick. I reject notions that they are fundamentally inadequate for most riders. Also, not all dealers want to pull the piggyback devices off the bikes at the earliest opportunity. My local dealer actually prefers them and recommend them over even the flash-based HD Super Tuners.

Originally Posted by ninetyzero

I'd swap the headers out and keep the stock ones incase they ever put a law in that requires us to have the cat.
That being said, if you just change your headers you wont void warranty unless you damage something installing it incorrectly.

Originally Posted by No Name Motorcycle Shop

Wurk Truk is correct. I formerly worked for a dealership. Although we never ran into a situation where a warranty was denied because of an Air Cleaner/Exhaust/Tuner upgrade we would tell people that technically it could be if HD felt that these upgrades were the cause of the "problem".
Also you will be much better off to spend the extra money and buy the Power Vision or TTS. We strongly encourage it. But we also understand that sometimes money is a factor on purchases. We see bikes come into our shop w/ other piggyback options when we do performance work and they end up removing these and buying the better tuner and having us dyno the bikes. You may not think that you will want more performance now but many a bike owner changes their mind on that down the road and would save money if they would just spend a little more initially for a good quality tuner.

Originally Posted by Armstronges

I'm still stuck on 2 years of ownership and only 5k miles.

Originally Posted by Armstronges

I'm still stuck on 2 years of ownership and only 5k miles.

Originally Posted by TKDKurt

I just had mine in for the 17,500 service, but in the parlance of Harley service writers, that's "2500 mile service" Any multiples of 5,000 (5K, 10K, 15K, 20K, 25K) are referred to as "5,000 mile service." Let's give the OP the benefit of the doubt and assume that was what he meant.