I bought the GT spec back in July and it has been used almost daily with no problems at all. Enzo couldn't have been more helpful, replying to all my questions quickly and sending the turbo out very quickly. On an ep82 with a Mines Ecu, FMIC, stainless manifold, HKS actuator, de cat and exhasut as well as a HKS evc boost controller, the turbo fitted perfectly first time with no problems at all. The turbo has been used at between 0.4 to 1.1 bar and at any pressure there is a noticeable difference from the stock item, pulling from around 3000rpm all the way to redline with stable boost and no boost creep. A very noticeable change in performance and response from the turbo and its cheaper than a stock CT9 from toyota and some rebuilds!