fuel moto sells the old style screamin eagle slip ons under a different name

 

Thanks for the tip about Fuel Motto bigdumbnoital00, but I went ahead &amp\\; bought the used 2004 SE's.&nbsp\\; So, now I'd like to run them for a few months on my 07 EG without changing the intake &amp\\; flash.&nbsp\\; I'm concerned about leaning-out the engine too much, &amp\\; with it being very HOT here in the Nashville area, I don't want to run the risk of over heating.&nbsp\\; I asked 2 seperate HD service managers if I could safely run the olds SE's without any other changes to the engine, &amp\\; I got 2 different answers.&nbsp\\; So, I'm counting on riders with experience to guide me.

 

I put on a set of 02 SE pipes, a big sucker air cleaner, and the HD Stage One download. Works great, sounds awesome, and the trike runs so much cooler now. You will love the setup.

 

The H-D stage one download?

pab,

What will happen is that the engine will initially run leaner in general with the mufflers. The computer will adapt and it will become just as rich as it was before (which is not to say rich enough for our tastes, rather those of Al Gore and friends [thanks for him, by the way, you Volunteer!]). The catch is that the mufflers will cause a non-linear change in flow versus the stock ones. They may flow greatly better in some specific operational areas and merely the same or maybe even less better in others.

It really should prove to not be dangerous over the course of a few summer months. But remember the old AFV poking its head into the room, so to speak. While cruising down the flat highway at steady speed in closed-loop mode the AFV will change to meet the conditions. If those conditions happen to cause/allow a disproportionately greater flow through the engine than the stock gear did, it will result (even if only momentarily) in an overly-rich condition in other areas where the difference is not so great between those mufflers and stock.

Heaven forbid that the steady cruise conditions happen to coincide with a specific airflow harmonic which actually flows less than stock. The Adaptive Fuel routines in the computer will dutifully lean out the mixture (rightly so). Then maybe you crank out some extra wick to pass a few trucks, going solidly into open-loop (no exhaust feedback) territory, and there the mufflers flow exceptionally better than the stock programming figured on. You can now be excessively lean, with no immediate means of correction, just when you need it most.

Changing breathing components, which invariably have differing flow characteristics due to harmonics at various frequencies, really does require a change in the computer programming. The good news is it can be much more finely tuned than a carburetor ever could, so ultimately this change is entirely for the better. The bad news is that you used to could cover a lot of sin by turning a screw or changing a jet whereas with this new gear which actively participates in the tuning you can end up fighting each other all over the place. The main thing is to give the computer good information about the specific flow characteristics everywhere.

A PC-III can be had for less than $300 to your door with a map already installed. It effectively reverts the system to a pre-adaptive-fuel model which is very much more like a carb to tune, and you should feel more comfortable with that. But in the mean time, I would not hesitate to install the mufflers. Worst case is you do not like the results and have to re-install the stock ones until you get your PC-III. I think it only takes about 15 minutes total to swap mufflers, worst case (I have always been bad about recalling how much time stuff takes - my internal clock can be unrealistic). Just make sure you do not put any undue physical pressures/tensions in the system as that can cause excessive engine vibration to transfer to the framework.

 

Pab, I run the old style SE slip-ons on my '07 1200 Sporty without any other mods & it runs great. You don't need the flash unless you change the breather to a high flow filter such as the SE/K & N/S&S, etc. The old style SE slip-ons sound 100 times better than the ones you can buy these days. My bike does't run any hotter, sounds much better but not TOO loud, and seems to make more power through all rpms. Go for it, just remember if you decide to do the breather mod then you will need the flash or a programmer to richen up the A/F ratio.

 

pab, I run the old style SE slip-Ons on my '07 1200 Sporty without any other mods and it runs great. You don't need the flash unless you upgrade the breather to a high flow, then you will need the flash or a tuner. The old style SE slip-ons sound great, but not TOO loud, the bike doesn't run any hotter, and it makes a little more power through the entire rpm range. The new SE slip-ons don't sound near as good as the old style ones do. Go for it.