As I search for a solution to my broken exhaust (1992 K100rs non-Cat) I seem to come across several K1100lt exhausts with Cat.
They are a bit newer, a bit lower mileage and generally lower priced which is important at the moment.

I don't mind running a cat and doing my bit for cleaner air but will it work properly without an ECU change so I can plugin the O2 sensor?

If I run sans O2 sensor will I end up plugging up the Cat and causing issues?

Any experience with this?

I know the after market exhaust are out there I just don't want to spend the money at the moment. Thought about re-welding but the re-weld that is there now was likely done without purging the exhaust system with Argon so there will tungsten oxide deposits which in my mind is what causes the failure of the re-welds from the inside out.

I may still just end up re-enforcing the area at the collector and hoping for the best.

The cracking in the exhausts was caused by resonance. The solution was to change the frequency of the resonance by fitting a large hose clip around the header pipes.
Regards Martin.

You'll need something to plug the hole for the O2/lambda sensor but other than that you should be OK and it should "bolt right up" to a K100RS4V.

Your system is made for non cat, but will run the same with a cat-exhaust.
You can't plug in the lambda anywhere, just hide the connector.

@MartinW wrote:The cracking in the exhausts was caused by resonance. The solution was to change the frequency of the resonance by fitting a large hose clip around the header pipes.
Regards Martin.

Thanks Martin
The broken exhaust currently on the bike was a clamp on it. I am not sure when it was installed though.

@duck wrote:You'll need something to plug the hole for the O2/lambda sensor but other than that you should be OK and it should "bolt right up" to a K100RS4V.

I think they are generally M18x1.5 are they not? the same as bigger spark plug thread. I should be able to come up with something for a plug.

@Arlina wrote:Your system is made for non cat, but will run the same with a cat-exhaust.
You can't plug in the lambda anywhere, just hide the connector.

I think I would pull the sensor and plug it just for to keep things neat and tidy.
Looks like I will end up with the LT exhaust.