EJ20

The EJ20 is a 2.0-litre horizontally opposed (boxer) four-cylinder built by Subaru from 1989. In turbocharged form it powered the Impreza WRX and STI, becoming central to Subaru's rally success and its distinctive performance identity.

The boxer layout gives the EJ20 a low centre of gravity and a characteristic offbeat exhaust rumble, often amplified by unequal-length headers. Paired with Subaru's symmetrical all-wheel drive, the engine helped define the rally-bred road car formula.

The EJ20 is highly tunable and well supported by the aftermarket, though its ringland pistons and cooling demand careful tuning at high power. It powered World Rally Championship-winning cars and remains a beloved enthusiast engine, later succeeded by the FA20 family.

Frequently asked questions

What car uses the EJ20?

The turbocharged EJ20 is best known from the Subaru Impreza WRX and STI, and also appeared in other Subaru models.

Why does the EJ20 sound distinctive?

Its boxer layout, often combined with unequal-length headers, produces the characteristic offbeat Subaru rumble.

Is the EJ20 a boxer engine?

Yes, it is a horizontally opposed four-cylinder, which gives a low centre of gravity and helps handling.

Is the EJ20 reliable when tuned?

It tunes well but needs careful management of pistons and cooling at high power, as ringlands can be a weak point.

Did the EJ20 win in rallying?

Yes, it powered Subaru's World Rally Championship-winning Imprezas in the 1990s and early 2000s.

What is EJ20?

Related terms

Frequently asked questions

EJ20

What is EJ20?

Related terms

Frequently asked questions