2015-2017 WRX STI Axle-Back Exhausts

Up to $40 off

In Stock

BLOX Racing
Stainless Steel Axle Back w/ Single Wall 3.5 Inch Polished Tips
Fits: 15-21 WRX/STI

$28900~~$329.00~~ Save $40

Pay over time · Est. $9.03/payment

ⓘ

Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.
Up to $51 off

In Stock

Private Label MFG
PLM Axle-Back Exhaust Muffler Deletes V2
Fits: 15-21 WRX/STI

Only 7 left

From $29900~~$350.00~~ Save $51
In Stock

Extreme Turbo Systems
ETS Axle Back Exhaust - Stainless Steel Tips - No Muffler
Fits: 15-21 WRX, 15-18 WRX STI

Only 1 left

$59500

Pay over time · Est. $18.59/payment

ⓘ

Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.
In Stock

EOS
Axle Back Quad Burnt Tips Exhaust
Fits: 15-21 WRX/STI

Only 1 left

$33000

Pay over time · Est. $10.31/payment

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Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.
FactionFab
Axle-Back Exhaust Polished Tip
Fits: 15-21 WRX, 15-18 WRX STI

$39000

Pay over time · Est. $12.19/payment

ⓘ

Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.
In Stock

Extreme Turbo Systems
ETS Axle Back Exhaust - Stainless - Burnt Tips - No Muffler
Fits: 15-21 WRX, 15-18 WRX STI

Only 1 left

$59500

Pay over time · Est. $18.59/payment

ⓘ

Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.
In Stock

Extreme Turbo Systems
ETS Axle Back Exhaust - Burnt Tips - w/ Muffler
Fits: 15-21 WRX, 15-18 WRX STI

Only 1 left

$69500

Pay over time · Est. $21.72/payment

ⓘ

Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.
In Stock

Extreme Turbo Systems
ETS 2.5in Axle Back Exhaust w/ Muffler
Fits: 15-21 WRX, 15-18 WRX STI

Only 1 left

$69500

Pay over time · Est. $21.72/payment

ⓘ

Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.
In Stock

EOS
Muffler Delete Axle Back 4 Inch Quad Tips Exhaust
Fits: 15-21 WRX/STI

Only 1 left

$29000

Pay over time · Est. $9.06/payment

ⓘ

Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.
Up to $159.99 off

Torque Solution
Torque Solution
Fits: 15-25 WRX

$84000~~$999.99~~ Save $159.99
Up to $72.54 off

Torque Solution
Stainless Axle Back Exhaust for Subaru WRX 2015-2025 and STI 2015-2021 | tqsTS-SU-883-S

$38300~~$455.54~~ Save $72.54
Up to $125.88 off

In Stock

MBRP
2.5in Dual Split Rear Exit w/ 3.5" CF Tips - T304
Fits: 15-21 WRX 2.0L/STI 2.5L

Only 4 left

$53499~~$660.87~~ Save $125.88

Pay over time · Est. $16.72/payment

ⓘ

Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.
Nameless Performance
w/ SPT midpipe Axle Back 3.5" Single Wall Neochrome Tips and No Muffler
Fits: 15-21 WRX, 15-18 STI

$74000

Pay over time · Est. $23.13/payment

ⓘ

Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.
Nameless Performance
Axle Back 3.5" Single Wall Polished Tips and No Muffler
Fits: 15-21 WRX, 15-18 STI

$69000

Pay over time · Est. $21.56/payment

ⓘ

Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.
Nameless Performance
SPT Midpipe Axle Back 3.5" Single Wall Polished Tips and No Muffler
Fits: 15-21 WRX, 15-18 STI

$69000

Pay over time · Est. $21.56/payment

ⓘ

Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.
Nameless Performance
Axle Back 4" Double Wall Polished Tips and No Muffler
Fits: 15-21 WRX, 15-18 STI

$89000

Pay over time · Est. $27.81/payment

ⓘ

Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.

Axle-back exhausts are the simplest way to change how your 2015-2017 WRX STI sounds and looks, without touching emissions equipment or the factory mid-pipe. Every system in this collection bolts directly to the stock mid-pipe flange for the 2015-2017 WRX STI, so fitment is guaranteed and installation is typically a one-hour driveway job with basic hand tools.

When comparing options, start with material. Most axle-backs here are T304 stainless steel, which resists corrosion far better than the aluminized steel many factory systems use — worth it if your car sees winter salt. Titanium systems cost more but save meaningful weight at the very rear of the car, where it helps balance most. Tip finish is mostly cosmetic — polished, burnt, black chrome, or carbon fiber — but check tip diameter against your rear bumper cutouts so nothing rubs.

Sound is the real decision. Axle-backs change tone and volume but keep the factory resonator and catalytic converter, so the increase is moderate: deeper idle, more character under load, and generally no highway drone. If your WRX STI is otherwise stock, any of these will stay civil. If you already have a downpipe or a cat-back, an axle-back is the wrong place to add more volume — look at resonated options or keep the stock mufflers.

Use the filters on this page to narrow by material, tip finish, and sound level. Every listing is confirmed for the 2015-2017 WRX STI chassis, so whatever you pick will bolt on without modification.