You have probably read some of the recent reports out that the next-generation Subaru WRX STI will pack 400 horsepower and 361 lb-ft of torque. We have read all the reports and the latest one from Forbes says they are getting this information from “sources close to Subaru” telling them the new-generation STI will be powered by the Ascent-sourced FA24 2.4-liter turbocharged Boxer powerplant.

Torque News reported this would be the STI’s new engine in April 2018 when Road & Track reported Subaru Corporation would use the new 2.4-liter turbocharged Boxer in the next-generation Subaru WRX STI replacing the aging EJ25 used in the current model. Now Motor Trend and Car and Driver are reporting the same thing.

Will the WRX STI be powered by the FA24 turbocharged engine?

The new FA24 turbocharged Boxer develops 260-horsepower at 5,600 rpm and has a broad peak torque band of 277 lb-ft between 2,000 and 4,800 RPMs. It’s currently used in the Ascent, Outback, and Legacy models. Subaru Technica International STI could easily rework the internals and bump up horsepower and torque considerably if they use it in the new WRX STI. Subaru could also use the powerplant mated with new hybrid technology being developed now with Toyota.

We think the STI engine pumping out 400 horsepower and 361 lb-ft of torque is pure speculation. It’s possible STI, Subaru’s performance partner could get that much horsepower from the 2.4-liter engine, but would Subaru go from 310 horsepower the current model produces increasing it 90 more horsepower?

How much power the new STI will produce is anyone’s guess

Subaru is not talking about the next-generation STI so it’s anyone’s guess how much horsepower is coming. We think the next-generation 2021 Subaru WRX STI will likely produce closer to 325-350 horsepower, similar to the exclusive limited edition S209 STI pumping out 341 horsepower and 330 lb-ft of torque. This would put the new STI in line to compete with the new Volkswagen Golf R reported to be coming with 328 horsepower, a 37 horsepower increase over the current model.

The all-new next-generation Subaru WRX STI will likely make its global debut sometime next year as a 2021-2022 model. It could get the new FA24 2.4-liter turbocharged Boxer engine as its new powerplant, but how much horsepower and torque it will be getting is pure speculation. Stay tuned.

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Denis Flierl has invested over 30 years in the automotive industry in a variety of roles. All of his reports are archived on our Subaru page. Follow Denis on Facebook, Twitter, Instagram, Subaru Report. Check back tomorrow for more Subaru news and updates at Torque News!

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