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View Full Version : 05 FLSTSCI 3" internal discs



roberti
06-17-2009, 07:27 PM
I have an 05 springer classic with a stage one kit and stock 88" motor. I have the 3" internal disc slip ons. All I want to do is make the bike louder. Right now I have 8 discs and the open end cap. My question is will putting in the max number of discs change the fuel air mixture enough to require a different map. I know this is usually different from bike to bike but typically does it change it enough to require a different map. I don't want to do any major hop-ups on this bike I just want to like the way it sounds and I haven't liked it for 4 years now with the internal disc.

jwells
06-18-2009, 08:31 AM
4 years is a long time to wait to ask about it?
8 discs with the open cap is pretty much open all the way (close to anyway), you could add some more discs, or for curiority sake just remove them all and try it. See how you like it. It will probably give you the added volume your looking for.
If it's is tuned to run properly the way it is, a little more flow is not going to change much or hurt anything. Always run it with some fresh plugs in it and pull them after 20-30 miles and see how they look.

roberti
07-09-2009, 08:48 PM
I was under the impression less discs would make it more quiet. Does removing them all make it louder?

jwells
07-10-2009, 09:01 AM
No Discs, No End Cap-Wide Open, nothing.

roberti
07-10-2009, 03:31 PM
I haven't done it yet I was just asking. Doesn't it get quieter with less discs?

jwells
07-10-2009, 03:36 PM
With a closed end cap, the fewer the discs the quieter it will be.

With a closed end cap, the more discs you have the louder it will be.

With no end cap, no discs it will be as loud as is possible with that muffler.

roberti
07-10-2009, 08:41 PM
I'll try it and let you know.
Is that a set-up you know people have tried in the past?
I was under the impression that was not recommended. I don't want the pipes loud at the expense of my engine.

jwells
07-13-2009, 08:15 AM
OK-Let's go back to your original question, and my original response.

You are over thinking this.

Original response;
8 discs with the open cap is pretty much open all the way (close to anyway), you could add some more discs, or for curiority sake just remove them all and try it. See how you like it. It will probably give you the added volume your looking for.
If it's is tuned to run properly the way it is, a little more flow is not going to change much or hurt anything. Always run it with some fresh plugs in it and pull them after 20-30 miles and see how they look.
06-17-2009 08:27 PM

roberti
07-13-2009, 09:19 AM
Thank you.
I understood what you were saying all along, I just didn't know that running it with zero discs was a recommended option.

jwells
07-13-2009, 09:46 AM
Thank you.
I understood what you were saying all along, I just didn't know that running it with zero discs was a recommended option.
Today 09:15 AM

Normally it isn't, it's too loud for us. But as stated, the difference between where you were (8 discs and open end cap) and nothing is minimal, so giving it a try isn't going to hurt anything-other than your ears!
Just go ride it and have fun!

Thanks!

roberti
07-13-2009, 10:32 AM
I just got into it and it looks like they installed the closed end cap over the open one at the dealer. No wonder why there was no increase in volume.

So I am going to see how it sounds with just the open end cap and the discs. Hopefully it doesn't change the mix too much and make it run bad taking the closed end cap off.

Unfortunately if I would have just looked in the end of the pipe I could have seen that a long time ago.

Local HD dealer fails again and I failed to catch it.

jwells
07-13-2009, 02:28 PM
Keep us posted.