I was thinking the 180 would be too much for it but from whats being said about it it sounds great. Two guy's at my field have DP Ultimates with YS 120 engines and I thought THEY were great.
My spare 180 was in a H9 U-Stick for two years untill last month when I hit a high tension wire at the far side of our field. Outstanding, powerful and reliable engine.
My new 180 GK is in my yet to be finished World GS Mustang so the "old reliable" 180 will go into the Ultimate.
Thanks,
Carlos

PS: What size is your smoke tank and battery and what dose the plane weigh complete without fuel and smoke oil?