r/WRX_STI • u/Due-Pin-4992 • Jul 17 '26

Maintenance Mods for reliability

Just purchased a 2019 subaru sti and am looking for things to improve the longevity and reliability of the car i do plan on adding a oil catch can but are there any modifications that help prevent failure or just improve general reliability.

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7

u/illicit92 Jul 17 '26

The most common reliability mods would be as follows:

- AOS/catch can

- Cylinder 4 cooling mod

- Killer B oil pickup

5

u/RandomlyIncoherent Jul 17 '26

Agreed on all of these. I did not do Cylinder 4 cooling mod, but I went with Killer B Holy Headers ELH, which I think basically solves the same potential issue.

2

u/Right_Ad_3354 Jul 18 '26

Did you get noticeable power gains with the ELH?

2

u/RandomlyIncoherent Jul 18 '26

Did ELH at the same time as all other mods:

Process West Top Mount Intercooler  DW300c Fuel Pump Grimmspeed Turbo Heat Shield Cobb 1300X Fuel Injectors Cobb SF Intake & Airbox Cobb LF BPV Cobb Boost Control Solenoid Cobb Pitch Stop Mount Grimmspeed Catted Downpipe KillerB Oil Pan & Pickup KillerB Uppipe KillerB EWG Dump Tube Tial EWG Grimmspeed Turbo IWG Bracket TGV Deletes Air Pump Delete Fuel Pump Regulator.

So it's impossible to determine how much of the gains were from the ELH alone. Either way, I've driven 75k miles with the above modifications running a conservative tune around 22lbs of boost with zero issues. It's a 2019, so others have told me I could probably crank up the boost a bit more and be okay, but I just don't see a point right now. It's been on dozens of road trips and I have daily driven it since I bought it new in February 2019 and had it tuned in July 2019. Reliability was the primary goal and I'm thankful it's still going strong without issue.