The switch to Renault power in 2014 may not have been the dream they initally hoped for but to be fair having Ferrari power may not have helped them much either. Unlike the extremely shrink wrapped Newey beast several doors down, Toro Rosso didn't suffer as much during the early stages, which is probably because with less budget they have to be that little more conservative. The Toro Rosso's always tend to be conceptually sound but lack the final touches that can haul them up the grid, which is all well and good when you're grooming future talent (be it engineers, management or drivers).
McLaren and Ferrari we have already seen and as such uses a sloping chassis to allow for the linear taper down to the nose tip which also permits the handlebar style camera mounts utilised by many of the teams in 2014.
STR9. Where it is obvious that some teams have been able to reduce the width of their sidepods and therefore have shrunken the inlet size is that they have to shrink wrap the bodywork around the mandatory side impact protection structures, which has resulted in some hanging their airflow conditioners off them creating small blisters. The bargeboards are an evolution of the serrated ones introduced during 2014.
Suzuka and is hung from a swan neck support off the base of the central pylon.