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Old 10-02-2020, 12:55 PM   #1
Scooby Newbie
Member#: 518019
Join Date: Aug 2020
Default 2005 STI - Timing Belt Job - What else to replace?

Buying a used STI at 90k miles that needs the timing belt replaced. I've bought the Aisin kit that includes the waterpump and bought an OEM thermostat and gasket and coolant.

I also bought new NGK Irridium spark plugs.

Is there anything else I should pre-emptively have done while it is in the shop to lower costs and have them all done at the same time? Headgaskets maybe? OEM or aftermarket? I plan on keeping the car under 350 HP and really only doing reliability/driveability mods.
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Old 10-04-2020, 12:56 AM   #2
Scooby Guru
Member#: 22412
Join Date: Aug 2002
Chapter/Region: SWIC
Location: Albuquerque, NM
2012 Legacy 2.5GT
Ice Silver Metallic


The other belts you remove (alternator and AC) since they are coming off, anyway. I'd leave the crank and cam seals alone unless you have a leak. At that age, I'd think about replacing the upper/lower radiator hoses, as well. If you bought the plugs off ebay or amazon, make sure they are not counterfeit (it's been a big issue)
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Old 12-02-2020, 03:11 PM   #3
Scooby Newbie
Member#: 520674
Join Date: Dec 2020
Chapter/Region: SCIC
Location: CA
2008 WRX STI Hatch
Hyper Blue


Have the TB, water pump, and boost lines (known to corrode and cause boost leaks) checked and/or replaced
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