Stacks/piggy relationships

[Dak44312]

I'm purchasing 36" stacks for my I/S. Pigs are unmolested, but I kinda feel like molesting them slightly (3-4", maybe?). A couple thoughts- can someone shed some light? I don't want drone, but I wouldn't mind a little more aggressive tone.

1. Leave the pigs alone. Afraid of droning since the pigs are further inside the exhaust. True?

2. If #1 isn't true, cut the pigs. What can I get away with?

3. Extend the pigs.

Interested to know how sound changes in each of these scenarios.

Thanks.

[Chrisj CMA]

I say extend them, don't cut them.

I did and it sounds way cool (no louder, if anything a tad quieter, but lots smoother, and more HP) and looks custom as well

PS.  I think #1 would be True.....more droning

[PharmBoy]

I too extended the piggies of my I/S a little over 1/2 inch past the chrome tips. Much quieter and I think that it looks neater.  I used 4130 aircraft tubing from Aircraft Spruce (877-477-7823) Part #03-06300. It has an ID that is only .008" larger than the piggies' OD.  I drilled and tapped a hole through both tubes and secured them together with a short 8-32 screw. (simple, secure, and quick).  I had already painted them with a heat resistant flat black.  I had gotten tired of the droning sound on the highway...Jim

[hubcapsc]

You used to be able to get these from BBT...



Piggies sticking out are without a doubt  quieter than piggies that end
before the muffler tip ends, and WAY quieter than piggies that are
cut off way deep down in the muffler tip.



-Mike

[Bagger John - #3785]

When I first got the bike which had them, I cut the piggies on a set of Tourer pipes. Left a little past the welded-on mounting nut.

These have gone from bike to bike over the years and are currently installed on my '01 I/S with a set of 36" slash-cut truck stacks. Deeper and throatier at idle and low speeds but about the same level as stock at highway speeds. Not objectionable whatsoever, even on very long rides.

Another set - from that I/S - had just enough trimmed off so that a set of Cobra tapered tips (remember those?) would fit without interference. They're on my second Tourer at the moment and are also throatier...but not any louder.

YMMV. I like the looks and sound of both of mine.

[Houdini]

Don't cut 'em.  I just bought replacement piggies from MarkT because I am tired of the drone.  I may even extend them out after reading these posts.

I'm sure you could find a set with the piggies cut if you really want to go that route, that way you could easily go back to stock once you hear the droning.

[DK]

I extended my stock piggies 20" in order to extend the exhaust of my trike beyond the rear bumper.

The exhaust now produces a throater sound and is maybe a little louder at lower speeds during hard acceleration. Power seems the same. I'm very pleased with it.

Before the mod it sounded like like it was reverberating around in a fiberglass  barrell which was pretty much what it was doing.

Dan

The pics I posted appear twice. I don't understand what I did wrong. Any advice would be appreciated.



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[davit]

The simplest way to extend the piggies is with repair couplings.  And the longer they are the quieter.  Not sure this is what you're after, but maybe you could cut the piggies drill the rear baffles for increased sound then install these couplings.  Just be sure they extend slightly past the end of the stacks so they don't drone.

[PharmBoy]

I missed the part where you said you were installing truck stacks. Here's what I did on my standard when installing truck stacks.  I used the same tubing, cut the ends on 45 degrees, polished and chromed them.  The main problem I had was that I had to make a special block to install the truck stacks.  I'll try to find a pic of that tool.  The one on the left is to make sure that the extensions are lined up and all the same cant.  The one on the right leaves a space for the extensions to protrude while driving on the truck stacks...Jim

[Andy Cote]

My standard came with piggies cut.  Definitely not the same as my Goldwing!  I did the straight cut truck stacks and extended out past the fender.  Any issue I had before has gone away just by moving the opening farther back.  No plans for piggy restoration.

[Ken Tarver]

i recently did a quietening mod to my new '99. Took off 9" reversed packs inside 36" stacks (louder than 6 packs).
Put on 22" Magnaflow packs back in the 36" stacks, they almost to the opening of the stacks.
They got grunt, loud if you rip on the throttle, but overall sounds good when riding moderately. But haven't been on a long trip yet.
Do have 2 quieter bikes though (just in case).

[Bagger John - #3785]

...Do have 2 quieter bikes though (just in case).

This is why I have a couple of Concours 14s hanging around the garage. One for extremely cold weather ('08) and the other ('12) for cool and rainy spring/fall long distance rides. Completely stock in terms of fuel and exhaust systems. Quiet. Wind noise at speed is louder than the engines, this with a full face helmet.

[hubcapsc]

...Do have 2 quieter bikes though (just in case).

This is why I have a couple of Concours 14s hanging around the garage. One for extremely cold weather ('08) and the other ('12) for cool and rainy spring/fall long distance rides. Completely stock in terms of fuel and exhaust systems. Quiet. Wind noise at speed is louder than the engines, this with a full face helmet.

Both of my Valkyries have stock exhaust... engine noise overtakes wind noise when you come to
that rare straightaway where it is safe to pass that truck  ...

-Mike

[Bagger John - #3785]

...Do have 2 quieter bikes though (just in case).

This is why I have a couple of Concours 14s hanging around the garage. One for extremely cold weather ('08) and the other ('12) for cool and rainy spring/fall long distance rides. Completely stock in terms of fuel and exhaust systems. Quiet. Wind noise at speed is louder than the engines, this with a full face helmet.

Both of my Valkyries have stock exhaust... engine noise overtakes wind noise when you come to
that rare straightaway where it is safe to pass that truck  ...

-Mike

Mine have slightly modified exhausts and are quiet at speed, else I would find a set of stock pipes and swap the offenders. Their exhaust tones are throatier (as I mentioned in a previous posting in the thread) but they don't drone.

My '99 Tourer came with a set of Cobra 6-6 pipes installed and the OEMs as spares. The Cobras were taken off and sold to another VRCC member as I wanted something less noisy.

[Fazer]

My 98 Tourer has truck stacks that extend beyond the fender about 6" and I can tell the piggies have been cut, but I do not know if they are cut flush, or if there is a nub left.  Is there any trick to removing the stack other than slipping them off after loosening any attachment screws?  I made a half ass attempt at removing one a while back, but since it didn't fall off in my hand after removing the screws, I gave up.  Are they a press fit that would take some force to loosen?  I do not have the stock tips as they did not get transferred with the bike.

I've gotten use to the sound around town, but on the highway the drone is pretty tiring.

[Jess from VA]

They are a very snug slip fit.  When I changed out to truck stacks, I had to hammer them on with a 2 X 4 over the flat cut tips and a rubber mallet.  I reused the stock three screws, but I may not have needed any screws at all.  With all the heat and cooling, and road crud and exhaust carbon, they get a bit welded on over time.  I suspect they can be wiggled off, but I'd use a little LockEase or PB blaster around the cracks before starting.

[Lyle Laun]

Fazer
A set of tips from Grumpy will eliminate the drone on your extended truck stacks.

Lyle

[h13man]

My standard came with piggies cut.  Definitely not the same as my Goldwing!  I did the straight cut truck stacks and extended out past the fender.  Any issue I had before has gone away just by moving the opening farther back.  No plans for piggy restoration.

Mine came to me this way also. Stock tips with piggies cut are very annoying for sure.  Open stacks 12" lg. resolved the "tinny" whine. Now has a mellow throaty sound and nice roar @ higher rpm's.