Follow along as we build this Subaru EJ25 engine from the ground up with part one of a multiple-part series that focuses on rebuilding the cylinder head.

The EJ25 with no fewer than 341 horsepower soldiers on, and it will do so for the foreseeable future. The engine features most of the modifications introduced by Subaru in the WRX STI Diamond ...

The flat-four boxer engine design is well over 100 years old, but it's still going strong, with applications in a number of ...

But until then, we've got the EJ25, and 341 horsepower might not be its ceiling. It might be an old engine, but it's stout and eminently tunable. We expect Subaru to give it the send-off it deserves.

This 2019 Subaru WRX STI in World Rally Blue Pearl, an original-owner, mechanically stock sedan with 37,200 miles, offers a thrilling, unmolested driving experience with hydraulic steering and a ...

It packed a turbocharged EJ25 engine tuned to make a little more horsepower - 282 hp to be exact - and it was paired with STI dampers, larger wheels with stickier rubber, and a six-speed manual ...

Kugay selected an EJ25 engine from the 2008 Subaru Impreza WRX STI for the swap. The idea was to keep the GT3 boxer-powered, which would best fit its rear-engine layout.

The engine of the P25 is the highlight, making 400 horsepower and 433 pound-feet of torque. Something interesting about it, though, is that it uses an EJ25 as its base, ...

Previous projects have included an E30 BMW with an F20C Honda 2.0-liter engine swap in 2021, and a 997.1 Porsche 911 GT3 with a Subaru Impreza STI EJ25 engine last year.

ENGINE TYPE: turbocharged and intercooled DOHC 16-valve flat-4, aluminum block and heads, port fuel injection DISPLACEMENT: 150 in 3, 2457 cm 3 POWER: 310 hp @ 6000 rpm TORQUE: 290 lb-ft @ 4000 ...

When it came down to matching and balancing our EJ25 engine assembly, we contacted Larry Revis of Revco Precision, located in Long Beach, CA. Revco does everything from polishing, ...