High discharge

I am in need of a rear discharge toilet with the highest discharge outlet. Most floor mounted rear discharge toilets are 4", I need about 8". If I can't find one that will work, I will have to raise the toilet off the floor 4". Don't want to do that.

I don't think you'll find one unless you go with a wall-hung. If you think about it, it if discharges at 8", the bowl must be quite high along with the water level so that it can discharge the waste. It only goes uphill so far!