Just ran my Max power M5 today with 2018 pipe on eight restrictor nearly done with the break in process, the engine is very very smooth, and the runtime so far on 8 restrictor is 10m38s to a flame out. Temping on an empty tank at 253F.
Needles still fat as pickup is a bit slow, once tuned am guessing 12mins easy at 260F maybe pushing 13mins on 7 restrictor.
Very impressed, holds idle well even during break in process.