imo and that of many you need to do your intake and exhaust together with a remap. pipes alone will decrease exhaust pressure. this will cause the a/f mix to need to be changed. some things go hand in hand, and this is one of them. remember, on the '07s its computered, sensored and programmed. if one variable is changed, it must be compensated for.

 

An engine can be compared to an air pump. You need to put more in to get more out. Simply changing the exhaust will do very little besides make noise because you are not pumping extra air into the engine. What this means is that there is no need to remap if you just change the exhaust. I have spoke with 4 different dealerships, all of which our company does business with, and also important people with Harley and the answer is that FI Sportsters will accept slip-ons without any problem. I cannot believe that the bikes will run lean with just the slip ons because after installing my Cycle Shacks, I could smell the beautiful aroma of premium gas being burnt. The bike will be tuned by a friend who owns a serious motorcycle exhaust company in the next couple weeks and I am positive that the bike has not leaned out very much. If noise is all that you are after skip the Sceamin Eagle mufflers, they are quiet, and get the Cycle Shack slip ons.

 

I put the Cycle Shack Slips on a couple weeks ago. Huge difference. Reason I went that route was the cost-to-quality ratio, not so much the sound....but damn they sound sweet. Think my neighbors are a little ticked in the a.m. when I'm heading to work but so what ; ) Did not remap after the slip on change and the bike did run a bit leaner.
Also, just finished adding the Screamin Eagle Stage I air cleaner and promptly had it remapped. Parts guy at HD said don't ride for very long once you change the A/C or "you'll burn up your engine" (direct quote).
Runs great after the remap, will post some pics soon. Got some other small mods so far.

07 XL1200N Nightster

 

I have an 07 Custom 1200 and i put Cycle shacks on mine....LOVE THEM....i have NO problems with the bike. The sound is loud.....didnt do any remapping and i put them on in 45 mins by myself....and as the carbon builds up inside they get a deeper tone...im enjoying them...for the money ya cant beat them....and i got mine from J&P. Here in korea you need loud pipes because thats the only way the korean drivers know your there/.....because they sure as hell dont look.....they blow through every red light....but they get nervous around loud HD's/

 

Thanks for your service and stay safe! I have a son in the US Air Force and another in his third week of Marine boot camp as I write this.

God be with all our soldiers.

 

Installed the Cycle Shacks and went for about a 30 mile cruise. Everything is running fine, and I don't think I've lost any power. No leaks (Stock gaskets with 850 miles on them) and they sound great. They're a little louder than I expected but they sound badass. So far it's running exactly the same as with the stock pipes, just sounds like it should . It took me longer getting the stock ones off because I couldn't find my can of PB blaster to help slip the stock ones off the headers. That **** is a godsend.

I get a kick out of the people making a twisting throttle gesture now, that sure didnt happen with the stock pipes.

 

Now I am more confused than ever on this stage 1 racket.

 

There is really not much to be confused about. If you just want louder pipes then you can likely get by fine with just a set of slip-ons like Cycle Shacks. If you want louder pipes and better performance then you need to do a complete Stage 1. That's slip-on's or full pipes, a high flow A/C and a remap for EFI.. In leu of a remap you may want to consider installing a PC-III, SERT, or otherprogramable module that gives you a better ability to fine tune the EFI system.

 

There's a lot of information in this thread ... unfortunately a lot of it is wrong. I imagine the majority of those delivering the incorrect information are repeating what they have been told. This is dangerous.

'06+ Dynas and all '07+ H-D's have closed-loop injection systems. These have what are called narrow-band oxygen sensors that will "switch" when the air fuel ratio passes 14.7:1. Under normal conditions the ECU will adjust for this AFR and if it cannot adjust for this, a code will be thrown and the system will run in a degraded open loop mode. You will know a code is thrown because the check engine light will go on. I have seen this happen, and I have also seen the Dyno results on an '07 bike with intake and exhaust mods so I know this to be true firsthand.

Unless you significantly change the configuration (injector sizes, compression, cams, head work, displacement upgrade) the ECU will correctly compensate for the changes you do such as air cleaners and exhaust during normal operation.

The thing to remember here is that you will only ever get 14.7:1 out of that ECU and changing intake and exhaust is not going to change that, good or bad. People telling you that they "run lean" from the factory and that changes "will only make it worse" really don't know what they are talking about. These systems run at a level that is optimal for efficiency and emissions. Yes, that's leaner than is perfect for the production of power but somehow all the engines made these days run at that AFR (cars and bikes) and they seem to do just fine.

If you want the engine to run cooler and make more power, you should investigate a tuning method that will allow you to change the AFR. This can be SERT, PCIII, various "fuelers", and replacement ECUs like the Thundermax. You absolutely do not need any of these if you don't want them, but you will make more power with one. Also, if you ride under severe conditions (parades, etc) then adding more fuel to help with overheating may be desirable. The chances are very good however that you will be more uncomfortable with the heat than your engine will.

This answer is intended for the riders that want to know what they must do. If you are a racer and your bike is not on the road and only operated at WFO, this information does not hold and you should probably not be getting your information from the Internet anyway. Even the most insane riders I know don't spend more than a fraction of their time at WFO on the roads, so this information should be good for 99% of you.

 

I started this forum with a comment regarding my HD service manager indicating you can add horsepower just by putting new SE pipes on the 07's.

So is the HDservice manager correctwhen he saysif you just putScreaming Eagle pipes on it you don'tneed the Air Cleaner ($140 HD price) and you don'tneed to Dyno it or anything since it is Fuel Injected andit will sense the change on it's own and adjust the mixtur ANDgain horsepower? If the Screaming Eagles reduce back preassure versus stock pipes, that would allow more air to flow into the cylinders at intake which would increase the amount of fuel/air compressed for power, right?