Ive been running a DE+T for 3 years at 220-240 on the standard hypergear highflow with plenty of track, skidpan, drift and daily duties on 98 and its fine, Can be a little prone to detonation on a hot day and doesnt take much in the way of timing with 98 when you start trying to wind in some good boost (I can only run about 15-16psi) that could be due to the shitty OP6 rear housing choking it up though
If you are wanting 250+ I would highly reconmend going e85 or WMI to keep the temps down.. Ill get around to doing these things one day this year