2021 Subaru WRX STI Tune-Up Parts
59 parts verified to fit your 2021 Subaru WRX STI for a complete tune-up. This is an easy DIY project — estimated 1-2 hours.
Air Filters
(3)primary
Fuel Injectors
(9)companion
DeatschWerks
DeatschWerks X2 Series Fuel Pump Module with Dual DW420 Pumps For 2008-21 WRX/STI
$709.00
DeatschWerks
DeatschWerks 08-21 Subaru WRX/STI X2 Series Fuel Pump Module
$429.00
DeatschWerks
DeatschWerks 08+ Subaru WRX/STI X2 Series Pump Module -8AN Feed w/ -6AN Return CPE Plumbing Kit
$749.00
DeatschWerks
DeatschWerks 265 LPH Compact In-Tank Fuel Pump w/ 08-12 WRX/ 08-15 STi / 05-09 LGT Set Up Ki
$159.00
Fel-Pro
Fel-Pro 13-14 Subaru WRX/13-21 WRX STI/00-12 Outback Fuel Injector O-Ring Kit
$5.91
DeatschWerks
DeatschWerks 08-21 Subaru WRX/STI X2 Series Fuel Pump Module w/ Dual DW300 Pumps
$659.00
DeatschWerks
DeatschWerks DW440 440lph Brushless Fuel Pump Single/Dual Controller w/ Install Kit 08-14 Subaru WRX
$529.00
Radium Engineering
Radium Engineering 08-21 Subaru WRX STi (EJ257 Only) RA-Series Fuel Pressure Regulator Kit
$256.45
Fluids & Additives
(47)consumable
Royal Purple
Royal Purple Max Gear Synthetic 75W90 Gear Oil - 1 Quart
$107.94
LIQUI MOLY
LIQUI MOLY 500mL Brake Fluid DOT 4
$151.91
aFe
aFe Pro GUARD D2 Oil Filter 02-17 Nissan Cars L4/ 04-17 Subaru Cars H4 (4 Pack)
$60.13
Royal Purple
Royal Purple Premium Synthetic High Performance Multi-Grade 5W30 Motor Oil - 5 Quart
$127.59
LIQUI MOLY
LIQUI MOLY 250mL Brake Fluid DOT 4
$89.42
LIQUI MOLY
LIQUI MOLY 1L Hypoid Gear Oil (GL5) SAE 85W90
$67.53
LIQUI MOLY
LIQUI MOLY 5L Molygen New Generation Motor Oil SAE 5W30
$210.34
LIQUI MOLY
LIQUI MOLY 5L Special Tec B FE Motor Oil SAE 0W30
$207.16
Tune-Up for Other Subaru WRX STI Years
Other Jobs for Your 2021 Subaru WRX STI
Frequently Asked Questions
What parts do I need for a tune-up on my 2021 Subaru WRX STI?
A complete tune-up on the 2021 Subaru WRX STI typically requires air filters, fuel injectors, fluids & additives. All parts shown on this page are verified to fit your specific vehicle.
How long does a tune-up take on a 2021 Subaru WRX STI?
A tune-up typically takes 1-2 hours and is rated as easy difficulty. Actual time may vary depending on your experience and the specific parts being replaced.
Can I do a tune-up myself?
Yes! A tune-up is an easy DIY project that most people can do with basic hand tools. It's a great way to save money on labor costs.
Are these parts guaranteed to fit my 2021 Subaru WRX STI?
Yes, all parts on this page are verified to fit the 2021 Subaru WRX STI using VCDB fitment data from manufacturers. Our fitment information is cross-referenced with industry-standard vehicle databases to ensure accuracy.
What brands make tune-up parts for the 2021 Subaru WRX STI?
We carry tune-up parts from trusted brands including K&N, AEM Induction, DeatschWerks, Fel-Pro, and Radium Engineering. Filter by brand to find your preferred manufacturer.
How much does a tune-up cost for a 2021 Subaru WRX STI?
The cost of a tune-up for the 2021 Subaru WRX STI depends on the parts and brands you choose. Browse the parts on this page to see current pricing. Doing the work yourself saves significantly on labor costs.