I have the .12 Ielasi Tuned and raced it at last year's biggest race. With the right pipe (tried several but the efra 2669 was by far best) it has great full range acceleration and top speed.
I had a previous Nova Flash PT that was tuned by Ielasi which was also excellent.
There is nothing wrong with a normal/stock tuned Nova's, but the Ielasi just seem to be a bit faster in terms of my lap times.
All engines seem very fast these days (once I find the right carb and clutch setting and gearing). Just takes a lot or trying and testing things with an eye on lap times more than on how it feels. Often my fastest laps don't feel like fastest laps.
Did you tryed with the 2679 pipe?? do you refere to the sport or 3CL?