The disadvantage of the stock STI axle back is that it is only 2.5' and you will loose some HP. It uses port fuel injection and runs a high-octane racing fuel with ultra high pressures. The cheapest route is to get a used stock STI axle back (100) or used aftermarket WRX/STI axle back (250), then have the hangers modified and rear tip extended. ![]() It gets a new re-designed crankshaft, connecting rods, and pistons over what the Isle of Man TT record-breaking car had. (Of course, a near-total replacement of a. Thanks to Prodrive’s vast experience with this powerplant, the WRX-sourced, 2.0-liter, turbocharged, boxer engine has three positions producing either 550, 575, or 600 horsepower, depending on what the driver needs to dial in. Thankfully, everything was covered under warranty and the STI returned to our fleet, covering its remaining 8000 miles with us in complete health. To say the least, they like the EJ20 and know how to squeeze every bit of horsepower out of it. Prodrive has built the 2.0-liter turbo mill for a number of WRC projects and it’s the engine that broke the IOM TT record. Current ones still running strong at 120k. Will work on new block and turbo this winter. Decided id spend a year and replace everything icould. Richard Thompson, Prodrive's top engineer on the project, gave a revealing interview to Motor Authority at the Goodwood Festival of Speed in the video below. Cant wait for the summertime when this thing starts roaming a local city near you. Why does Prodrive use the WRX-sourced 2.0-liter EJ20 mill and not the standard EJ25 2.5-liter turbo boxer? We brought the WRX STI Type RA NBR Special here to set a record and call attention to the WRX STI Type RA that we will launch later this year, explains Subaru comms manager Dominick. That’s no surprise, but the WRX STI Type RA NBR Special that will attempt to set a new Nurburgring track record runs the 2.0-liter turbo mill. When the new 2018 Subaru WRX STI Type RA production model arrives, it’s powered by the standard 2.5-liter turbocharged boxer engine.
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