Well the Glanza S injectors feel a bit better but that could all be a placebo, so will need to get it dynoed again. To be honest bigger injectors will not do much at all unless you've got more air going in i.e. Corrolla/Glanza S manifold ported and polished head, manifold, TB. Too bigger injectors will lose you power as you want it running the best air fuel ratio. Powerflow arn't that bad, its just where you get it done. At first the bloke treated my like an imbosile but then I got to know him and he does a good job. There are a few places to read up on this, check out jezza's thread on austarletclub.com.