Exhaust modification on CB 1100 RS

[Saltani_imp]

I’m sure people have noticed that the new CB1100 come with completely sealed (seamless/welded) pipes. Any suggestions on ho to modify the mufflers to make them a little louder??

I looked through the end opening and found an area that could have a hole drilled in. Anyone tried that?

 

[Bheezy27403_imp]

Yes. There is a thread around here somewhere where a couple members tried a few things. Use the search feature to find it. Or some other industrious member will add a link here eventually. I'm not sure the results were overwhelming because the main source of sound dampening comes from the cat which is upstream in the system.

 

[Cormanus]

Not sure anyone’s done anything with the 2017 bike exhausts.

 

[Lord Popgun]

I couldn't find anything.

 

[Bheezy27403_imp]

Ah, didn't know he was asking about the '17's.

 

[itstuantran_imp]

If you look through the tail pipe with a flash light, you will see there are 3 holes with dia approx 6mm each. What you should do is to use a long rod of steel with larger dia, say 8mm, to enlarge those 3 holes, sound will be improved. That what i did.

 

[Cormanus]

Apologies itstuantran. I forgot you’d modified your RS.

 

[itstuantran_imp]

No problem Cormanus, it's just a little play on my stock exhaust, i've replaced the stock exhaust with full titanium 4-1 system

Apologies itstuantran. I forgot you’d modified your RS.

 

[jtopiso_imp]

If you look through the tail pipe with a flash light, you will see there are 3 holes with dia approx 6mm each. What you should do is to use a long rod of steel with larger dia, say 8mm, to enlarge those 3 holes, sound will be improved. That what i did.

I think you mean "changed"

 

[Saltani_imp]

If you look through the tail pipe with a flash light, you will see there are 3 holes with dia approx 6mm each. What you should do is to use a long rod of steel with larger dia, say 8mm, to enlarge those 3 holes, sound will be improved. That what i did.

how did you manage that? drill? hammer it through?

 

[itstuantran_imp]

I hammered through the hole, you should work little by little. Increase the size gradually and test it till you feel happy with the sound

If you look through the tail pipe with a flash light, you will see there are 3 holes with dia approx 6mm each. What you should do is to use a long rod of steel with larger dia, say 8mm, to enlarge those 3 holes, sound will be improved. That what i did.

how did you manage that? drill? hammer it through?

how did you manage that? drill? hammer it through?

 

[rboe]

Please correct me if I don't recall this correctly but with the '13's and '14's with the cat, Even with the muffler completely removed the sound is fairly well muffled. Most folks did not find any appreciable gain in sound quality modifying the stock can and went aftermarket - with most gains achieved when the stock header and cat were also replaced.


If memory serves, a Jim something offered up his stock '14 muffler for my project bike I bought from Paul. Once the For Sale thread went bye-bye I lost that contact. If they would PM me I would greatly appreciate it.

 

[Saltani_imp]

I did the hammering through and I honestly can’t hear a difference. What if I just made one large hole 25 or 30 mm?

I hammered through the hole, you should work little by little. Increase the size gradually and test it till you feel happy with the sound

If you look through the tail pipe with a flash light, you will see there are 3 holes with dia approx 6mm each. What you should do is to use a long rod of steel with larger dia, say 8mm, to enlarge those 3 holes, sound will be improved. That what i did.

how did you manage that? drill? hammer it through?

how did you manage that? drill? hammer it through?

how did you manage that? drill? hammer it through?

 

[peterbaron]

I heard a rumour that for some countries, 2019 CB1100 will come without cat and muffler, for sound effect concerns...
:huh:
ABSOLUTELY FREE air snorkel,.
Was installed once for 2 hr TEST ride only and removed.
You ONLY must pay for shipping.
Increases power.... UP TO 19 HP.......
Good luck to all concerned.
P.S. In case of multiple offers, I solemnly reserved the right to pick recipient of my choice. No returns.

 

[jedd_imp]

I did the hammering through and I honestly can’t hear a difference. What if I just made one large hole 25 or 30 mm?

I hammered through the hole, you should work little by little. Increase the size gradually and test it till you feel happy with the sound

If you look through the tail pipe with a flash light, you will see there are 3 holes with dia approx 6mm each. What you should do is to use a long rod of steel with larger dia, say 8mm, to enlarge those 3 holes, sound will be improved. That what i did.

how did you manage that? drill? hammer it through?

how did you manage that? drill? hammer it through?

how did you manage that? drill? hammer it through?

This is what the 2017 tip looks like in a cross section.

Looking at how it's baffled, I think one large hole that you suggested should do the trick.

 

[apex1_imp]

I did the hammering through and I honestly can’t hear a difference. What if I just made one large hole 25 or 30 mm?

I hammered through the hole, you should work little by little. Increase the size gradually and test it till you feel happy with the sound

If you look through the tail pipe with a flash light, you will see there are 3 holes with dia approx 6mm each. What you should do is to use a long rod of steel with larger dia, say 8mm, to enlarge those 3 holes, sound will be improved. That what i did.

how did you manage that? drill? hammer it through?

how did you manage that? drill? hammer it through?

how did you manage that? drill? hammer it through?

This is what the 2017 tip looks like in a cross section.

Looking at how it's baffled, I think one large hole that you suggested should do the trick.

This is what the 2017 tip looks like in a cross section.

Looking at how it's baffled, I think one large hole that you suggested should do the trick.
I don't know how you found that picture, but it is cool that you did.

 

[Fruitbat_imp]

@Saltani - Let us know when you have finished your mod. I'd love a Wyvern system but can't justify the cost.

 

[dbarkdoll_imp]

Please correct me if I don't recall this correctly but with the '13's and '14's with the cat, Even with the muffler completely removed the sound is fairly well muffled. Most folks did not find any appreciable gain in sound quality modifying the stock can and went aftermarket - with most gains achieved when the stock header and cat were also replaced.


If memory serves, a Jim something offered up his stock '14 muffler for my project bike I bought from Paul. Once the For Sale thread went bye-bye I lost that contact. If they would PM me I would greatly appreciate it.

Not true. With the stock muffler removed this bike (2013) is obnoxiously loud. I installed the Arrow slip-on (sans baffle) and she purrs like a panther now.