My Arrows GTR21 only just came alive after 1 1/4 Gallons. It is an absolute beast now with what seems like an endless top end and silky smooth bottom end.

I have to date had GO engines and Novarossi's and I would say it has a little less bottom end than a plus 4 team, but a lot more top end. The GO engines don't even compare in my opinion.

I thought i was running lean it was so quick on the straight but it tempted at 220 after 10 mins hard running. And it is pretty fuel efficient, doing about 8 mins per tank at the moment and I will put a smaller venturi in it to see if I can do 10. Then I am laughing!