Trimmed down exhaust too loud, help!

[Shag]

I have a 99 I.S. purchased used several years ago.  One of the previous owners cut off the last foot or so of the 3 pipe exhaust tips starting from the "muffler baffle" aft.  I guess he did this to "enhance" the sound quality.  Sure it sounds great and all but for long rides (which is what the bike was made for) it's just too damn loud.  I don't have any I.S. buddies with stock pipes so I really don't know how much of a difference this mod makes, but I assume it add to the noise level. 

Other then buying stock pipes, does anyone have any suggestions as to what I can do to tone it down?  Is it possible to pack anything in the chrome tips or is there any after market exhaust kits that are made to make pipes quieter rather then noisier?  I'm looking for the cheapest option first.

Thanks guys!

"Shag"

[R J]

Contact MarkT and see if he has any innards from his glass pak conversion to weld beck in.    This is really an out in the back corner of right field chance he has any that are good enough to use.

http://www.horseapple.com/

But ya no ask, you will never know.

[hubcapsc]

If there's enough of a stub left on your piggies, there's people who have repaired them with
copper plumbing, and liked it - really...

You have to hope that the previous owner didn't also drill out the inner baffles... you can
poke a rod down in there to find out...

The pipes on my bike were chopped and drilled (and rashy and rusty) when I got it... awful... a VRCC member sent
me his cut off piggies, but I ended up with some awesome new pipes... you can have the old
piggies if you want... the plumbing parts idea might be better though...

The Mark T idea sounds good (especially if you've got drilled baffles).



-Mike

[GJS]

Hey Shag,

I too have a 99IS with the piggies cut off.
I too found I did not like the extra volume on long trips.

When I cut the pipes I left a 1+ inch stub.
I have found that 3/4" copper pipe works perfectly to re-extend them.
Get yourself some 3/4" pipe wit 3/4" couplers, Solder the pipe to the coupler and slide it over the stup (as long as you have stubs). You can vary the length of the pipe to match the rest of your tail pipe. I have the triple pipe Hondaline tail sections.

I drilled a very small hole though coupler and stub and dropped in a tight fitting cotter pin.
This way I can change to other lengths or remove them entirely. I'm happy with the results, and my wife and I appreciate the quite at highway speeds,

Good luck.

Glenn 

[Kingbee]

[alph]

shag,

i agree with you whole heartitly.  my riding buddy had his piggies plucked also, not having them did make it quite a bit louder, but for a long trip it would get old!!

i'd try to swet some copper pipe on myself before you spend big bucks on new exhausts.

al.

[Shag]

I appreciate everyone's input!  The copper pipe idea might work, the only problem I see is that the guy who trimmed the pipes, trimmed them plush with the baffles.  I still might be able to rig something up though.    It's by far the cheapest fix, worthy of a try. 

Thanks guys!

[Farther]

I guess there is a varity of experiences.  I cut the piggies on my Standard and thought the decibel went up about .1-.2.  More of a lower tone than greater noise. 

[John U.]

Pipes with cut piggies are a bit louder, with the baffles drilled quite a bit louder but the main problem I've found is that droning sound when the piggies are cut short. It seems that the drone is created by the sound being resonated by the empty exhaust tips.
One of these days I'm going to experiment with some glass mat held into the tips with wire hoops. If anyone has tried that please post your experience.
I like the extra sound but the drone is hard to take with some helmets.

[98valk]

Pipes with cut piggies are a bit louder, with the baffles drilled quite a bit louder but the main problem I've found is that droning sound when the piggies are cut short. It seems that the drone is created by the sound being resonated by the empty exhaust tips.
One of these days I'm going to experiment with some glass mat held into the tips with wire hoops. If anyone has tried that please post your experience.
I like the extra sound but the drone is hard to take with some helmets.

I have found that due to my airbox mods that most of the drone is coming from those 6 throats under the tank. running oem windshield right now and its really bad. when I remove the shield for hotter weather much quieter.

[BonS]

Anyone with experience between Mark T's exhaust and cut piggies and the resulting drone? My piggies are cut on my IS and the drone at highway speed isn't near as much fun as in-city riding.

[John U.]

Posted by: CA ExhaustCoatings
I have found that due to my airbox mods that most of the drone is coming from those 6 throats under the tank. running oem windshield right now and its really bad. when I remove the shield for hotter weather much quieter.

Must be more than one kind of drone.
Mine started with cutting piggies.
However, both must involve some kind of resonance. When I changed the exhaust system on my GM diesel truck I had a serious drone problem. In that case attaching two pieces of heavy angle iron to the exhaust pipe with SS straps either deadend or change the frequency of the sound and resolved the drone. Since my problem began at the rear of the exhaust system I have to believe that the solution will involve the same area.
There are likely many solutions to the drone problems, the challange is to find one that is cheap, invisible, safe, light weight and is effective for that particular situation.
Some one will no doubt point out that ear plugs meet the above criteria.

[fudgie]

Huh? 

[bigdog99]

piggies cut off flush, baffles drilled out (1/2") all 3, and semi turn-outs only turned down, noise hits the road still sounds throaty!

[BonS]

piggies cut off flush, baffles drilled out (1/2") all 3, and semi turn-outs only turned down, noise hits the road still sounds throaty!

And looks really, really good!

[Farther]

What brand, size and model car tire is that?

[bigdog99]

Hankook (Sp) 205-55-16

[MarkT]

I have cut-off "piggy-plates" I call these parts, in IS & std exhaust types - these are the piggies cut off with the back plate.  You grind your outlets flush then have a welder put these on by welding a bead around the perimeter.  It's worked for quite a few guys now.  If interested drop me an email at valkstuff@horseapple.com

[FryeVRCCDS0067]

piggies cut off flush, baffles drilled out (1/2") all 3, and semi turn-outs only turned down, noise hits the road still sounds throaty!

What kind of tire is that? Is it sticky?

[bigdog99]

not sure if its spelled right, but Hankook,   i love this tire. i went to Harisin AR last fall and rode the road thats 110 miles and 662 cureves. i did check by foot pegs later because the tire allowed me to spark on both sides as we went aroung the corners. the longer i ride it the better it feels. now have 900 miles and still feels secure.

[FryeVRCCDS0067]

not sure if its spelled right, but Hankook,   i love this tire. i went to Harisin AR last fall and rode the road thats 110 miles and 662 cureves. i did check by foot pegs later because the tire allowed me to spark on both sides as we went aroung the corners. the longer i ride it the better it feels. now have 900 miles and still feels secure.

Thanks.

[fudgie]

Yep, the Hankook K-106. It is a great tire.  Never had it slip yet. Slow speeds its great. Lays alot of rubber across a intersection to.  Like bigdog has said its great in the curves. Took them 15 mph curves of the Black Hills with ease. It about 8" wide but my contact patch is 4 1/2". So its a little round. So far 9,000 miles and 10 States on mine since spring 09. Not even a wore spot on it. I'll get another.

[bigdog99]

mine has same mileage, let me know when you get one. I may need to know when to expect it. Right now i cant tell you when i will need it. i may have to watch for rot on the side walls

[JetDriver]

I cut the piggies off my Tourer pipes and love them.  Due to some road rash at the header, I'm replacing the Tourer pipes with some OEM I/S pipes.  I see the piggies are quite a bit longer on the I/S vs the Tourer.  Am I going to get a different result cutting the piggies off the I/S pipes than I did with the Tourer?