If you think that’s worth it, then it’s a great upgrade. Using one on a WRX will reduce intake temps hugely, but it will also increase turbo lag. The factory STI intake system has been proven to flow over 240kW, so all we need to do here is find a Version 3 STI intercooler, or if you like the look of a front-mounted intercooler, they can be had at a very reasonable price, though there’s a trade-off. With the VF22 installed along with the other STI parts, you should see around 150–165kW at the wheels - that’s a good 30kW gain at the wheels for very minimal outlay. Once you have the VF22 turbo, you need to find the Version 3 STI ECU, an orange-sticker air-flow meter and yellow-top 440cc injectors to complete the STI upgrade recipe. Make sure you purchase a boost pressure gauge to keep an eye on any boost increases after installing the STI turbo. This is a ball-bearing unit with the largest exhaust housing out of all the factory turbos, and is good for 298kW (400hp) in the right application (the factory non-STI block won’t support this power, however). The Version 3 STI was blessed with the best factory turbo, the VF22. Extracting extra power is relatively simple if you have the know-how and the required tools. From factory these engines produce around 125–135kW at the wheels, depending on the dyno and engine condition. The non-STI WRX feels punchy and responsive from factory, and though the golf-ball-sized TD04 turbo doesn’t put out big numbers, the set-up does make for a nice car to drive around town.
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