1962 GS160 - just added twin pipe exhaust, change jet?

I just added the twin pipe albarth exhaust to my standard 1962 GS160. Everything is OK but does anyone recommend changing the main jet ? I have been told that it may now run a bit lean and I wouldn’t want it to cease.
Thanks

this pipe is based more on aesthetic appeal than performance and i would be very surprised if you would need to alter the main jet.

mr_mojo,
you have already received the answer. I agree with them too.

Usual story,check your plug.If it’s a nice chocolatey brown then leave it alone.If it’s light coloured then up-jet to the next size and see if it run’s any better.