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Home >> Subaru >> 2021 >> WRX STI >> Repair and Diagnosis >> Engine Performance >> Engine Ignition System (2.5L) >> Spark Plug >> Installation >> LH Side
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LH Side

Install in the reverse order of removal.

Tightening torque (spark plug): 

21 N.m (2.1 kgf-m, 15.5 ft-lb)

Tightening torque (ignition coil): 

16 N.m (1.6 kgf-m, 11.8 ft-lb)

Tightening torque (air duct): 

6.4 N.m (0.7 kgf-m, 4.7 ft-lb)