Toilet - increasing soil pipe angle to improve exit of #2s

[headache5678]

I would like to raise my toilet pan say 20mm higher to improve exit strategy of unwanted lurkers (number 2s) and to tile the floor.

I am comfortable dealing with the inlet and overflow water pipes but I am unclear what to do about the large diameter soil outlet pipe. Do I need to somehow chop it off and install another one ?

[ChrisR]

It depends on the exit route of the exhaust....

Some pans are hopeless, the submarines just won't leave the pen.

[TicklyT]

You may be able to replace the pan connector (between the soil pipe and pan) with an offset connector. 20mm is quite a common offset.
Some makes cater for up to 100mm offset.

I don't know whether it will help clear the pan. That may be down to a wonderful piece of water-saving regulation that reduced cistern capacities from 9 to 6 litres. It apears to save 3 litres of water each flush, but now you often have to flush the thing twice to clear it, using 12 litres of water.