Website seems to say 140 to 160--
"Many have asked if the Diablo can also be flown with a regular non-vector pipe. Well, yes, we will offer an option for those as well. However, the diameter of the thrust tube will be smaller as it will be a dual walled pipe, which still needs to fit unter the taileron spar. No problems, as the engines should be limited to 140-160N in the non-vector application anyway."