new toilet - 6 litre flush and side exit

[cloudburst]

Hi,

I'm aware that some modern 6 litre toilets don't flush away well. Does anyone know of a brand which does work okay?

Also, I'll have to use a right angled connector for a side exit to the toilet outlet for space reasons. Would this contribute to any problems with flushing?

I could connect a basin outlet to the toilet foul pipe within the room, using a boss strapping. Would this give backflow problems up into the toilet pan?

Hope someone on this very good forum can advise, please.