on the mx3 i had with the t3/t4 setup it didnt spool until almost 3500-4k, and the redline was 7k max on the bp. It was useable power just not what i really liked, and i couldnt enjoy the pull. But with the old setup with the vj11 it would run out of breath at 5k. My next setup on my gt, im gonna use a vj20, maybe 23 if i can get my hands on one. But its all about knowing what your working with. it seems to be a trend nowadays to just throw the biggest turbo on a motor and some injectors, and afc and go... its so retarded if u look at the mod list of some peoples boosted cars.