Exhaust without catalytic converter legal despite e number?

Hey I received a sports exhaust as a gift when I bought my motorcycle. The previous owner pointed out that the exhaust doesn't have a catalytic converter and is therefore illegal. However, the exhaust still has an E-number. Am I still allowed to ride it, or will anyone notice if I install it and get…

Is a self-installed exhaust bad for the warranty, is it a Duke 125? Is it good for the IxRace Mk II?

Hello, I'm currently considering installing a different exhaust on my KTM Duke. The IXRace MK II caught my eye because it's available for as little as €250 and is also a bit louder than the original exhaust. It's not a complete system. My questions now are whether the installation will affect the warranty (it still…