Question 1

What parts do I need for a tune-up on my 2021 Subaru WRX STI?

Accepted Answer

A complete tune-up on the 2021 Subaru WRX STI typically requires air filters, fuel injectors, fluids & additives. This page groups parts commonly associated with that year, make, and model; confirm your trim on product pages for exact fit.

Question 2

How long does a tune-up take on a 2021 Subaru WRX STI?

Accepted Answer

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.

Question 3

Can I do a tune-up myself?

Accepted Answer

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.

Question 4

Are these parts guaranteed to fit my 2021 Subaru WRX STI?

Accepted Answer

These parts are listed for the 2021 Subaru WRX STI using manufacturer fitment data. Some products fit every trim, while others require trim confirmation. Use your trim in My Garage or the product page fitment checker to confirm exact fit.

Question 5

What brands make tune-up parts for the 2021 Subaru WRX STI?

Accepted Answer

We carry tune-up parts from trusted brands including AEM Induction, Standard Motor Products, Beck Arnley, Pronto, and K&N. Filter by brand to find your preferred manufacturer.

Question 6

How much does a tune-up cost for a 2021 Subaru WRX STI?

Accepted Answer

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.

2021 Subaru WRX STI Tune-Up Parts

Air Filters

AEM 19-20 Subaru WRX STI 2.5L DryFlow Air Filter

AIR CLEANER CHECK VALVE

AIR FILTER

CABIN AIR FILTER

Engine Air Filter

K&N 09-18 Subaru Forester 2.5L H4 F/I Cabin Air Filter

K&N 2019 Subaru WRX STI 2.5L F/I Replacement Air Filter

Panel Air Element

Fuel Injectors

DeatschWerks 08-21 Subaru WRX/STI X2 Series Fuel Pump Module

DeatschWerks 08-21 Subaru WRX/STI X2 Series Fuel Pump Module w/ Dual DW300 Pumps

DeatschWerks 08+ Subaru WRX/STI X2 Series Pump Module -8AN Feed w/ -6AN Return CPE Plumbing Kit

DeatschWerks 08+ Subaru WRX/STI X2 Series Pump Module -8AN Feed w/ -6AN Return PTFE Plumbing Kit

DeatschWerks 265 LPH Compact In-Tank Fuel Pump w/ 08-12 WRX/ 08-15 STi / 05-09 LGT Set Up Ki

DeatschWerks DW440 440lph Brushless Fuel Pump Single/Dual Controller w/ Install Kit 08-14 Subaru WRX

DeatschWerks X2 Series Fuel Pump Module with Dual DW420 Pumps For 2008-21 WRX/STI

Fel-Pro 13-14 Subaru WRX/13-21 WRX STI/00-12 Outback Fuel Injector O-Ring Kit

Fluids & Additives

aFe Pro GUARD D2 Oil Filter 02-17 Nissan Cars L4/ 04-17 Subaru Cars H4 (4 Pack)

aFe ProGuard D2 Fluid Filters Fuel F/F Oil; Nissan Cars 03-13; Subaru Cars H4 04-13

ENGINE OIL COOLER

Engine Oil Cooler Adapter Seal

Engine Oil Filler Cap

Engine Oil Filter

Holstein Parts 2OPS0037 Engine Oil Pressure Switch

K&N 03-07 Mitsubishi Lancer Wrench-Off Oil Filer

Tune-Up for Other Subaru WRX STI Years

Other Jobs for Your 2021 Subaru WRX STI

Frequently Asked Questions