Free shipping on orders over $99 · 2-year warranty · Fitment guaranteed Find my parts

◆ Performance Auto Parts · Est. 2008

Built for the
drive.
Not the parking lot.

OEM-spec replacement parts, race-proven upgrades, and 50,000+ verified fitments. Whether you're restoring a 1972 Datsun or tuning a 2024 WRX, we have the part that fits — and we guarantee it.

Find my part Shop by vehicle

50K+ Verified fitments

2yr Warranty

24h Ships same day

In stock · 12,400 SKUs

◆ Featured Product

Apex-GT Brake KitNEW

OEM-spec guaranteed Free shipping over $99 Same-day shipping 2-year warranty 50,000+ fitments Race-proven quality OEM-spec guaranteed Free shipping over $99 Same-day shipping 2-year warranty 50,000+ fitments Race-proven quality

◆ Chapter 01 — Shop by system

Eight systems.
One obsession.

◆ Chapter 02 — In the catalog

Best-sellers,
this month.

All 12,400 parts

◆ Bestseller

Apex-GT 4-Piston Brake Kit

Fits: 2015–2024 WRX / STi · 2017–2023 Type R

Slotted rotors · Carbon-ceramic pads · Stainless lines

★★★★★ 4.9 · 412

$489 $489

◆ New

Exhaust · Performance

Apex-X Cat-Back Exhaust

Fits: 2018–2024 Mustang GT 5.0 · 2022–2024 Camaro SS

+18 whp · Carbon fiber tube · Washable filter

★★★★★ 4.8 · 287

$1,290

Suspension · Coilovers

Apex Coilover Suspension

Fits: 2008–2021 WRX / STi · 2002–2007 Impreza

32-way adjustable · Front camber plates · 60mm struts

Fits: 2022–2024 Civic Type R · 2017–2021 Civic Si

−18 lbs · +12 whp · Titanium · Drone-canceled

★★★★★ 4.9 · 324

$540

Apex-GT 4-Piston Brake Kit

Fits: 5×114.3 · 18×9.5 · +22 offset

17.4 lbs each · 6061-T6 · Track-rated

★★★★★ 4.9 · 156

$2,196 $489

◆ New

Exhaust · Performance

Apex-X Cat-Back Exhaust

Fits: 2014–2020 F-150 · 2016–2023 Silverado

9,200 lumens · DRL · Plug-and-play · 5yr warranty

★★★★★ 4.8 · 421

$1,290

◆ Chapter 03 — Engineering

OEM-grade.
Race-proven.

Engineering standards

OEM-spec tolerances

Every part is manufactured to original-equipment specifications. ±0.001" on all critical dimensions. CAD-designed, CNC-machined, laser-verified.

±0.001"
tol.

Materials traceability

Full mill certs on every batch. 6061-T6 aluminum, 304 stainless, G3000 cast iron, ceramic matrix compounds. We document it; you can verify it.

100%
traced

Track-day tested

Every performance part is validated at 6+ track-day events per year. Buttonwillow, Laguna Seca, Nürburgring. Real braking, real heat, real wear.

6+
events/yr

Fitment guaranteed

Enter your year, make, model. We guarantee the part fits your specific vehicle — or your money back, no questions. 50,000+ verified fitments in our database.

50K+
fitments

0.001" Tolerance

5yr Warranty

99.8% Fit rate

● REC Dyno Cell 03 — Burbank, CA

◆ Chapter 04 — Dyno Cell

Every part dyno'd.
Every claim verified.

We don't trust marketing — we trust data. Every performance claim on every product page is backed by a before/after dyno chart from our in-house Dynojet 424xLC2 cell. The chart you see is the chart you get.

In 2025, our in-house team tested 2,184 parts across 38 different vehicle platforms. 94% met or exceeded published performance claims. The 6% that didn't? We pulled them from the catalog and refunded every customer who bought one.

2,184 Parts tested in 2025

94% Met claims

38 Vehicle platforms

◆ Chapter 05 — From the garage

Real builds. Real reviews.

★★★★★

"Bought the Apex-GT brake kit for my 2019 WRX. 4 piston fronts, slotted rotors, stainless lines. Bed-in took 200 miles. Stops like a totally different car. No fade after 30 minutes of canyon driving."

James T.

Verified buyer · Mar 2026

2019 Subaru WRX

★★★★★

"Replaced my Type R's OEM exhaust with the titanium cat-back. -18 lbs on the rear axle is no joke — the car rotates so much faster now. Drone-canceled resonators work as advertised, no highway drone at 80mph."

Marcus R.

Verified buyer · Feb 2026

2023 Honda Civic Type R

★★★★★

"Fitment was perfect. Entered my '21 Mustang GT, it pulled up exactly the right cold-air intake for the 5.0 Coyote. +18 whp on the dyno, exactly as advertised. Carbon fiber tube is gorgeous under the hood."

Sarah K.

Verified buyer · Jan 2026

2021 Ford Mustang GT

Built for thedrive.Not the parking lot.

Eight systems.One obsession.

Best-sellers,this month.

OEM-grade.Race-proven.

OEM-spec tolerances

Materials traceability

Track-day tested

Fitment guaranteed

Every part dyno'd.Every claim verified.

Real builds. Real reviews.

New parts.Builds. Reviews.

Built for the
drive.
Not the parking lot.

Eight systems.
One obsession.

Best-sellers,
this month.

OEM-grade.
Race-proven.

Every part dyno'd.
Every claim verified.

New parts.
Builds. Reviews.