19/06/2026
Subaru Forester XT – EJ20 Dual AVCS Engine Swap 🔧🔥
This Forester XT came in for a complete engine replacement, and we opted for a dual AVCS EJ20 to give it a fresh, reliable heart. Every step was handled with precision to ensure performance and longevity.
Previous EJ25 Engine:The original EJ25 was tired — low compression across cylinders meant almost no power and constant struggle to build boost. It was clear this motor had reached the end of its life.
Now, with the EJ20 installed, compression is back where it should be, and boost response has returned — restoring the Forester’s performance.
Build Highlights:
Exhaust AVCS deleted and solid cam pulleys installed
New intake gaskets
New valve cover gaskets
New cam seals
New rear main seal
New spark plugs
New air filter
Engine flushed
New oil & oil filter
Power steering pipe repaired with new hose
New power steering fluid
All new clamps on water and breather pipes
Breather pipes replaced
New fan belt
Cracked exhaust headers replaced with a solid set
Original uppipe (with cat & EGT sensor) replaced with STI uppipe
ECU software updated: fueling corrected and EGT disabled
Result:This Forester XT now runs stronger, cleaner, and sharper — the EJ20 Dual AVCS paired with the STI uppipe delivers a responsive drive while ensuring long‑term reliability. Compression and boost are back, giving this Subaru the punch it was missing.