View Full Version : Tuning SUPERTRAPP for S&S 95" upgrade

11-27-2009, 01:50 AM
Hello everyone
I installed a S&S 95" stage II kit (cylinders, pistons, heads, cam .585) on a 2004 Dyna sport EFI. I already had Supertrapps mufflers before mounting the kit and it run well (sound & performance wise) with 14 discs (see picture). Now the sound is howfully high (>110 db on idle), really ambarassing in downtown streets.... I removed discs down to 6 total and kept the closed end cap and the sound is even nastier (higher frequency and as loud) and performances are down...
Seems to me I can't remove too many discs to keep the flow section decent.
Any suggestion ? Change the entire muffler type to get a deep loud sound ? Get longer ones? Get a 2 in 1? Thanks all for any advise...

11-27-2009, 11:47 AM
We have never had ANY system, including no baffle drap pipes idle at 110db?
I would suggest checking the mounting, something else is wrong. The increase in bore and such will make it a little louder, but not that much, no is 96" very big to be causing that much of a difference. Check the mufflers, mounting, leaks, etc.

With that said, if you do decide to go to a different system, the SuperTrapp SuperMeg 2:1 is by far the best.

11-28-2009, 02:00 AM
Thanks jwells. What else than the discs can be mounted wrong?: I checked the line from the cylinder exhaust, the connection to the muffler, and the right position of the discs being well stacked flat. However the Zodiac distributor of your products in France is telling me that I might reload fiberglass "stuffing" inside. But where is "inside" once you have removed the discs? If this is true, I have not done that since I have the supertrapps 5 years ago and 50000 km.!!! Can the internal structure of the muffler (where the discs are screwed) be dissociated from the chrome body? I see one screw only in the middle of the external lower part of the muffler. Is that it? Any recommandation if it is locked rusted in order to pull all this thing out?
Thank again for your expert advises. Competent people are not that common....
ps: do you confirm the SupertrappSuperMeg2:1 will give me deep low sound? ....and keeps the benefit of my S&S 95" kit?

11-30-2009, 07:41 AM
The mufflers are servicable, can be repacked with fiberglass muffler packing.
Remove the mufflers from the bike, remove the cosmetic end-cap and the disc assembly. Remove the button head screw on the bottom of the muffler body that screws into the core assembly. Friction is the only thing holding the core assembly after these screws are removed. Work at knocking the core assembly out the back of the muffler by using a hammer and wooden dowel (piece of broom handle) from the inlet end. If they have never been serviced they can be stuborn; however with some penetrating oil (soak overnite), maybe a little heat, a lot of patience and persistance they can usually be removed.
Ask your dealer to provide you with good quality fiberglass muffler packing, normally blanket form. Wrap the core, secure with paper tape to hold in place while installing core assembly in body.

11-30-2009, 07:43 AM
The SuperTrapp SuperMeg is a good option and will provide a deep throaty sound.

12-05-2009, 08:03 AM
Thanks Super trapp Guru!!
Did exactly what you described and it worked very well..!! Knocked the core out of the mufler by slamming it down on my workbench exactly vertically. It was empty, was never packed with fiberglass. Filled it with good fiberrock blanket. Mounted it back by slamming it backwards: trick: make sure the core screw hole is VERY well align with the muffler screw hole and work it step by step in. Sound is greatly muffled, much better!!!! thanks a lot.

12-05-2009, 08:09 AM
Despite the fiberglass filling that worked well, I really believe I will buy a SuperMeg 2:1 next spring...!!
However, distribution price in Europe is a rip off: 900€ dealer price after Zodiac distributor and dealer take their margin. It means 1350 US$!!! versus 675 $ in the US. Where is the catch?

12-07-2009, 07:42 AM
Have you ever tried to ship an oversized box across the Atlantic? Yeah, it may sound padded; however if there is an issue, our European distributors/dealers can provide the attention and Customer Service you deserve on a local level.

04-05-2010, 11:54 AM
I really think I will get a 2 in 1 supermeg for my Dyna sport. However, does the clearance on the right side still good compared to the stock mufflers?, or even better? Our European roads have a lot of nice curves and I am alread
y touching quite often with the stock mufflers. I don not want to turn only on left curves..!!
Thank you for your answer.

04-06-2010, 07:44 AM
This pipe has been around for a while and we have not had any clearance issues/complaints from our customers.

04-06-2010, 12:02 PM
Sorry to insist with detailed questions, but I do not want to do any mistake for this kind of investment. My dealer is telling there might be an issue with the oil gauge opening of my Duna 2004 sport and the rear cylinder tube of the Supermeg. See attached pictures. Thank you for your answer.

crazy canuck
04-06-2010, 08:16 PM

I have the supermeg 2:1 on my Head-Quarters 95" and let me tell you that you will not regret it. I've tried 3 different 2:1 pipes and the supermeg is by far the best performing and least loud pipe out there. Just my honest opinion.


04-07-2010, 02:17 AM
Thanks Crazy canuck
I have no doubdt about the performance and sound, considering the lenght and large volume of the Supermeg. My only concern is regarding the mounting on my dyna Sport 2004 where the rear cylinder tube of the exhaust seems right in the way of the oil gauge, thus making it impossible to open. See pictures. Anyone have mounted this supermeg on a Dyna Sport 2004? Can Supertapp moderator tell about this possible issue?

04-07-2010, 07:34 AM
When HD moved the dipstick location slightly a few years back there was a problem with the 2:1 which we immediately corrected by changing the bend on the rear headpipe. It's very close; however if you follow the instructions, you should not have an issue.

04-07-2010, 11:27 AM
Thanks Supertrapp Guru
I really appreciate your quick answer and information to your customers.
I guess I will now have to run to my Supertrapp dealer: The Riviera Shopper store, Biver, France. :)

04-17-2010, 02:37 AM
Hello Supertrapp Guru
Here it is !! Got the baby mounted. Perfect look, Nice S shape on the rear cylinder, and a clerance to the floor more than enough.
Quick questions however: I have a S&S kit 95" on this Dyna 2004. How many minimum discs to keep a reasonable low sound but keep the engine breath enough?
Any packing to add?
Thanks for your answer

04-19-2010, 07:18 AM
16-18 discs with your mods should breathe/perform well. The muffler comes with a "full" compliment of packing straight out of the factory, there should be no need to add or repack until time & miles indicate it's getting louder.

04-21-2010, 06:01 AM
Again thanks for your answer, and the time you take for it.
You guys at Supertrapp are good to give consistant answer to your customers (even foreigners like me).
To ALL : I had the same reactivity from the Supertrapp online store representative Jeff Wells. This shows the total committment of this company to his customers. And I work in Marketing..... I wish every company work like you do..!!!

07-10-2010, 05:57 AM
Hello bschultz,
You might remember me, as I was happy to install a Supermeg 2/1 on my Dyna 2004 a couple of months ago.
Well, the exhaust works fine, however, I am very disapointed by the quality of the chrome. The end part of the megaphone became all yellow/blue, and the very end part of it (after the discs) looks even shrinked...:(
Please have a look on the attached pictures.
Do you have waranty on this expensive part?
Thank you for your answer.

07-12-2010, 07:26 AM
ALL chrome starts to discolor when exposed to temperatures in excess of 800-900 degrees Fahrenheit. Normal bluing/discoloration is 6-12 inches from the head ports, beyond that is normally an indication of running lean. We've also seen excessive bluing with the increased use of Dyno tuning and repeated WOT runs.
How many discs are you running?

07-12-2010, 09:35 AM
Hello bschultz,
I got the fuel map for my powercommander directly from Dynojet.
I am running 14 discs in order to keep the sound not too loud in the neighberhood....
The yelow/blue started after I did a 3 hours ride, that might explain the heat, but surprised me. 3 hours ride is not that long...
Can the muffler be replaced through the dealer I bought it from? (Riviera Shopper/Biver/France)
Thanks you for your help,

07-12-2010, 12:12 PM
You can; however the 14 discs sounds restrictive and may cause the same results on a new can.

07-12-2010, 04:28 PM
OK, so how do I proceed for the muffler replacement?
Do you have a warranty code I can give to the dealer?
They are closed for summer vacation until July 20, but I can do it after. There is no rush.
Do you need the current muffler sent to you for the exchange?
Thank you for your support.

07-13-2010, 07:24 AM
All SuperTrapp products come with a limited one-year warranty against workmanship and mechanical failure; however, bluing/discoloration is considered a tuning issue and NOT covered under warranty. It would be your dealer’s discretion whether they chose to assist you with the muffler replacement.

07-15-2010, 02:13 AM
Understood, however, the shrinkage of the end (see picture) is a mechanical design issue....don't you think?

07-15-2010, 07:32 AM
The muffler body on your system has been in production for over a decade and we have not had issue with it during that time.