Remove cat from up pipe, if necessary (05/06 model years included cat in up pipe) Any up pipe that fits an 02-11 STI will fit your 05-09 LGT (though not all of these pipes will necessarily be catless)
Install upgraded oil lines (Infamous products recommended by many)
KillerB oil pickup to prevent starvation
Check/top off engine oil on every fill up. With EJ engines, it has been well documented that the turbo can catastrophically fail due to oil starvation. Furthermore, these engines have a tendency to burn oil.
Do an oil analysis (i.e. Blackstone) once you settle on an oil/filter combination that works for you. Should confirm that you OCI is adequate.
For those with automatic transmissions, drain/refill transmission fluid every 5-7k miles...Alternatively, complete a full 5EAT DIY flush once every 30k miles--this may be easier since it's only once every couple of years for most people (DIY Flush info here: http://legacygt.com/forums/showthrea...sh-197248.html.)
Let your engine/oil/other fluids warm up before you race a civic. for rationale please see notes from #4. it's a mod, don't be a 'tard.
Drain/refill differentials every 30k miles. For 5EATs this will include both the front and the rear differentials. For 5MTs this only applies to the rear differential (front differential shares fluid with the transmission).
Replace timing belt, tensioners, water pump at or before 105k miles.
Flush brake fluid every two years (at a minimum)
Stop driving your car.
Other Reliability Upgrades / Modifications
Disconnect DRLs to prevent shortened headlight lifespan
Inspect fuel lines for deterioration.
CV boot under downpipe, recommended to check regularly (i.e. during oil changes) for wear.
OEM LCA bushings known to tear; many aftermarket replacements available, look for solid ones that are one piece rather than OEM style that has space between and can tear.
Replace swaybar endlinks with aftermarket parts to reduce "clunks" in the front end.
A new tune (pro, e-tune, AP) can help to prevent burned valves
Install gauges for oil pressure/temp and boost to track any significant changes and diagnose problems as they arise.
Check wheel bearings prior to 100k miles / 8 yrs. Subaru will replace noisy bearings through these service intervals under warranty.
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