them ecu's are fine when you know what they're mapped for, and with something simple like a basic rrfpr or old school apexi afc (£30 at most) you can pump up the fuelling to run even a large turbo setup (say, k24/k26/td04 etc). it just depends how much you get it all for in the first place really. they're awesome for what they are, considering what little you have to do (i.e plug and play). power fc's are obv the way forward, hence why i now have one, although, as they're discontinued, they're gonna start going silly prices, the last ep82 one i saw sell on the auctions went for STUPID money. its the same as the ep91 model, but with the ep82 they use a harness, to enable the unit to fit (but the unit itself is identical to the ep91 model).