t3, t3/t4... those words(?) get thrown around like nothing these days. You guys have to realize there are differant variations of t3/t4 hybrid turbos. A better measure for choosing an appropriate turbo is by calculating your motor's CFM, and determining where you want to have more power (low, mid, top end). Then by checking out a turbo's compressor map you can easily find the best turbo to suit your needs.