Slip-on exhaust (end can only) yes or no?

[S-Westerly]

Yesterday in an owners forum I happened to mention that I was thinking of changing the end canof my exhaust.  I would leave the hideous cat unit but swap out the end can. The responses I got made me somewhat irked. Basically I got called every kind of idiot known to man for even thinking about messing up this finely tuned instrument  blah blah blah. I make no claims to being any kind of expert in this field so if its a potentially damaging thing to do then obviously I won't. If its harmless then I will. Any opinions on the forum? Not that I'll necessarily listen to them mind!

[bonio]

I'm no expert but I've got a completely uninformed opinion, which I'm happy to commit to print here.

Yes, a new end can may affect the way the engine works. By altering the flow between the cat and the outside, it can change back pressure felt at the exhaust valve, and so affect the action inside the cylinder. People often retune an engine after replacing the exhaust. But the question is: by how much. I expect that the cat acts as a significant buffer between the engine and end can, significantly reducing the effect of changing it over. Also, your replacement end can may have very similar flow characteristics to the original. 

If it were me, I'd ask the can manufacturer what action they recommend you take to ensure the engine runs as the manufacturer intended after replacing the can.

[Gerontious]

I have a scorpion end can on my bike. They also sold a full system but I just couldn’t be doing with the added faff. And with modern bikes there’s nearly always added faff when you go down that road. And I get all the faff I ever need every September so why add more?

 

The vast majority of the more quality leaning makers will have tested the can in your bike… or one if it’s family. It shouldn’t be a concern unless you’re going as cheap as possible.

Edited April 1, 2024 by Gerontious

[curlylegend]

4 hours ago, S-Westerly said:

Yesterday in an owners forum I happened to mention that I was thinking of changing the end canof my exhaust.  I would leave the hideous cat unit but swap out the end can. The responses I got made me somewhat irked. Basically I got called every kind of idiot known to man for even thinking about messing up this finely tuned instrument  blah blah blah. I make no claims to being any kind of expert in this field so if its a potentially damaging thing to do then obviously I won't. If its harmless then I will. Any opinions on the forum? Not that I'll necessarily listen to them mind!

If your moto has a catalytic converter it will be electronically fuel injected.  I am aware of people changing parts of their exhaust system, in some cases the whole system from front to back, and they all seem to be of the opinion that if the oxygen sensor is left in place, the Electronic control unit automatically reprograms itself when it senses changes to the exhaust system.  There are different techniques involved, some, Royal Enfield for example, just require you to start the engine and leave it idling for about 10 minutes and then off you go.

But I would research this thoroughly before changing anything.

[Mississippi Bullfrog]

26 minutes ago, curlylegend said:

If your moto has a catalytic converter it will be electronically fuel injected.  I am aware of people changing parts of their exhaust system, in some cases the whole system from front to back, and they all seem to be of the opinion that if the oxygen sensor is left in place, the Electronic control unit automatically reprograms itself when it senses changes to the exhaust system.  There are different techniques involved, some, Royal Enfield for example, just require you to start the engine and leave it idling for about 10 minutes and then off you go.

But I would research this thoroughly before changing anything.

True but sometimes the ecu has parameters that an aftermarket exhaust system exceeds. I know a few Bobber owners who go too far with modifications and find the bike can't adapt to the increased airflow. In which case a remap is needed. It can be a DIY job if you have access to the right software. For Triumphs TuneEcu does the trick. 

 

But if its just an end can from a decent manufacturer that won't be needed.

[curlylegend]

10 minutes ago, Mississippi Bullfrog said:

True but sometimes the ecu has parameters that an aftermarket exhaust system exceeds. I know a few Bobber owners who go too far with modifications and find the bike can't adapt to the increased airflow. In which case a remap is needed. It can be a DIY job if you have access to the right software. For Triumphs TuneEcu does the trick. 

 

But if its just an end can from a decent manufacturer that won't be needed.

Yes, indeed, that's very true !   It MIGHT be more complicated than you think.

[S-Westerly]

The one I'm thinking about is a Mistral version which is sold by a Guzzi specialist and according to the blurb doesn't need re-mapping. So I'm guessing it should be OK but.... I really like the bike just not too keen on the end can. Bloody ugly imo.

[Mississippi Bullfrog]

8 hours ago, S-Westerly said:

The one I'm thinking about is a Mistral version which is sold by a Guzzi specialist and according to the blurb doesn't need re-mapping. So I'm guessing it should be OK but.... I really like the bike just not too keen on the end can. Bloody ugly imo.

Then go for it. 

 

End cans on most new bikes are pig ugly. It's one factor that took me towards the Bobber. The stock exhaust is lovely. 

[RideWithStyles]

Missi BF is correct. All depends on what the system is, has, cant or cannot do from a starting point. weither its a program or a design.

each unit as a component and bike as a whole is individual. you could put 5 bikes together and RR them, each one will be slightly different in their character of power delivery, one might be slightly more power or flatter torque, might run a bit lean at the bottom of rev but ok at the top or be the other way.

so if you know what type of engine character your dealing with and the effects of what the component(s) your swapping to is expected or could do. so does it allow more flow at the bottom of the rev range to fill in the hole the std system is expected or priority of the higher revs where a racer can might be more suited? so does changing it make the parameters too far ff what a ecu can do from its std factory map and create holes or errors? depends on its design. thats why if the bike seems too different after the fitting parts  a custom map is a sensible thing. so if you buy it put some budget asside to factor this in.

Edited April 2, 2024 by RideWithStyles

[Mississippi Bullfrog]

1 hour ago, RideWithStyles said:

Missi BF is correct.

Can you tell my wife this startling revelation?

 

I think she needs to know.

[manxie49]

I often just change the end can on my bikes, as I have done with the one I have now.  It gives a nicer, but not to obnoxious note, and gave me a weight saving off over 3kg.  I've never had any running issues with changing an end can.  However, I did a full system change on a Fireblade, decat, remap, the full works, and ended up having nothing but trouble, so much so I'd never do it again.  As for an end can, and this is just my opinion, I see it as just an extension, if you're leaving the bread box alone and not doing a full system, I can't see what issues it could cause.  A bike will actually run fine without an end can, I know that as fact, someone over here up at the Creg had his end can nicked last TT, He rode it down South to the dealer like that without any issues.  I find on a lot of these owner specific forums you tend to get some very self righteous individuals, that do have a tendency to piss you off if you let them, thats why I dropped the BMW forum.

Edited April 2, 2024 by manxie49

[Mickly]

18 hours ago, S-Westerly said:

Yesterday in an owners forum I happened to mention that I was thinking of changing the end canof my exhaust.  I would leave the hideous cat unit but swap out the end can. The responses I got made me somewhat irked. Basically I got called every kind of idiot known to man for even thinking about messing up this finely tuned instrument  blah blah blah. I make no claims to being any kind of expert in this field so if its a potentially damaging thing to do then obviously I won't. If its harmless then I will. Any opinions on the forum? Not that I'll necessarily listen to them mind!

It’s your bike, do wtf you like to it, nobody else’s business.

[geofferz]

On my old mt10 if you change the endcan it doesn't make it any sound difference at all. 

 

On my gixxer it changed it from sounding like a baby trying to blow out a candle to a lion gargling a hammer. So much better. 

 

Looks wise erm yeah

 

Saved like 5kg too which I hear is good. 

 

End cans are a great first mod. I don't think you usually need a remap. 

 

There will always be people who think a full system is a must. 

 

I'm not one of them - 200bhp is ample. 

[rob m]

5 hours ago, Mickly said:

It’s your bike, do wtf you like to it, nobody else’s business.

Exactly. 

[Simon Davey]

This backs up everything we've said.

 

 

[RideWithStyles]

21 hours ago, Mickly said:

It’s your bike, do wtf you like to it, nobody else’s business.

yes IF thats in the context of assuming its the right call/decision to make in the first place doesnt it?

[Grumpy Old Git]

Forget the end can and buy a Harley 

[Mickly]

3 hours ago, RideWithStyles said:

yes IF thats in the context of assuming its the right call/decision to make in the first place doesnt it?

Nope, everyone’s entitled to make their own mistakes

[RideWithStyles]

until someone has to fix your f**k up.

[S-Westerly]

Still entitled to f**k things up and no obligation to get it fixed. Not planning on sticking a coke can on the end. 

[Mississippi Bullfrog]

1 hour ago, S-Westerly said:

Still entitled to f**k things up and no obligation to get it fixed. Not planning on sticking a coke can on the end. 

Quite right. I find a baked beans tin much better. 

[Ian Frog]

I believe sweetcorn (cans) can give a certain particular resonance if that helps ?

Do what you want and fook em ! (or words to that effect).

Cheers

Ian 

[JRH]

Nah, forget the coke, beans or sweetcorn cans. You need this can, ‘cause then you get to eat the biscuits first. And it’s a bit more exotic.

 

(this thread needs biscuits)

Edited April 4, 2024 by JRH

[skyrider]

looks good