OK, my .02 and personal experience....I have an 04 Lowrider with SE air cleaner and D&D Step tuned headers. I opted for the download even though it was for the SE slip ons. The tech at the shop said the difference was negligible and the computer would make up the difference. My gas mileage went from 51hwy to 48 hwy but it was a noticable difference in seat of the pants power. I did notice the old 2000 rpm surge indictive of a lean run. Although I never experienced popping on decel. My brother had basically the same setup when he decided to install a PC-3 I opted for the DFO and my reasoning was IF the DFO crapped out I would still be able to run OK. Without the DL I would be running EXTREMELY lean. He gets about 38 hwy and I get about 41 hwy the bikes run about the same as far as WOT take off. However I have installed a switch on the DFO and can turn it off at will when I desire better fuel mileage. He has decided the small increase in power was not worth the decrease in fuel mileage and has since removed the PC-3 and gone back to the SE DL. One other note the SE DL will increase the top end RPM's. I realize there has been some confusion as far as the 06 dynas go and from what I understand some of the earlier problems with the DL also required an injector change. Who knows maybe by 07 HD will have it all figgured out and in the hands of ALL the dealers. Just my experience.

 

The second improved version of the 06 Dyna 'download' is found in the SERT G version CD. The file name is 141NX002. It makes for a very effective base to tweek and get a very strong but efficient map.

I can't see eliminating the O2 Sensors with the PCIII or any other system. Seems to me this is the easy way out. That's taking 3 steps backwards to the beginning of electronic Fuel Injection. The trick is to get the Closed loop system to work for you, not against. The closed loop system is chasing down 14.6:1 A/F ratio over most of the map. With the sert, you can change the O2 sensor bias and change the closed loop ratio a bit richer in cruise mode. This maintains economy. You can turn on and off where you want closed loop operation. You can adjust the timing, acceleration enrichment, rev limiter, VE table's and a bunch of other parameters. There really is no comparison to tuning these closed loop systems and the results are fantastic. Myself and others on this forum have worked on this problem, have the maps to back it up, and show what a tweeked closed loop system is capable of doing. I didn't even mention the diagnistic logging features which is worth $150 itself. Having used the other systems, my vote is cast. No comparison.

 

FL, How much is that ? Can it be used for any aftermarket exhaust and A/C? Thanks