Got my savvy today and run it in and had a play and i have to say, i love it.
The big wheels are staying on as they give it a bit of extra height to get over the rough stuff. And it still beats a 4.6 savvy with them on anyway.
Engine ran in nicely with no problems (apart from a small roll which took half of the top fin off lol) i've leaned out the high speed and it accelerates brilliantly but without flipping and the gear change is near perfect from the factory which was a suprise.
Personally i think the engine can be pushed a lot further, as its hardly hot, and i'm not suprised either, its bloody massive. I also think the extended chassis help it handle a bit better and stops it from going head over tail when breaking and wheelying.
Pics to follow