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Aftermarket performance auto parts, parts designed to help you win

Parts designed to help you win.

High performance parts for Miatas, S2000s, BRZs and more!

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4 Reasons to Choose Us

Built by Car Enthusiasts

We care about your project car! If it’s not something we wouldn’t put on our own car, we won’t sell it.

International Shipping

No matter where in the world you are, we have shipping options to your door.

Wide Range of Products

R Theory offers almost any part that you would need for your build. Check out our line up of R Theory Designed parts as well!

Customer Support

We are here to help before and after your purchase. With decades of combined experience, we will help to ensure everything goes smoothly.

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R Theory Motorsports

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sku: RS-10011

NA/NB MX-5 Miata Adjustable Swaybar Endlinks - One Pair

USD $77.00

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R Theory Motorsports

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sku: SQ0692910

License Plate Quick Release Bracket - PQR (Universal)

USD $83.99

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R Theory Motorsports

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sku: SQ0016427

NA/NB MX-5 Miata Low Profile Mixing Manifold/Water Pump Inlet

USD $125.99

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R Theory Motorsports

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sku: RE-1005(2/3)

License Plate Quick Release (PQR) Additional Pieces

USD $50.39

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SALE

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R Theory Motorsports

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sku: SQ9172193

NA/NB MX-5 Miata Billet Aluminum Alternator and Water Pump Pulley Set of 2 Pullies

Was: USD $167.99

Now: USD $159.59

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R Theory Motorsports

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sku: RV-XPOWST

Powder Coat My Vents!

USD $39.99

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R Theory Motorsports

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sku: RS-200x1

NA/NB MX-5 Miata Frame Rail Braces (1990-2005)

USD $239.00

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R Theory Motorsports

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sku: SQ0293460

NA/NB MX-5 Miata Carbon Fiber Mirror Kit (1990-2005)

USD $90.99

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SALE

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R Theory Motorsports

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sku: RE-10141-xx

NA/NB Billet Powersteering Pulley Bezel

Was: USD $105.08

Now: USD $91.99

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R Theory Motorsports

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sku: RA-20041

Titanium Splitter Skid Block/Skid Plate

USD $58.95

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R Theory Motorsports

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sku: RV-20052

NC MX-5 Fender Vents (2006-2015)

USD $191.99

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R Theory Motorsports

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sku: RE-10131-xx

Billet Throttle Cable Bracket For Miata Skunk2 Manifold

USD $82.99

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Exedy

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sku: EXE15806

Exedy 2013-2016 Scion FR-S H4 Stage 1 Organic Clutch - 15806

MSRP: USD $765.24

USD $659.45

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Pedders

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sku: PEDPED-BK008

Pedders 2015+ Ford Mustang GT S550 Rear Brake Kit - PED-BK008

MSRP: USD $284.95

USD $265.46

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Pedders

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sku: PEDPED-909148R

Pedders EziFit SportsRyder Front Right Spring And Shock (Twin Tube 25mm) 2013+ Subaru BRZ - PED-909148R

MSRP: USD $249.95

USD $233.96

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Pedders

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sku: PEDPED-909148L

Pedders EziFit SportsRyder Front Left Spring And Shock (Twin Tube 25mm) 2013+ Subaru BRZ - PED-909148L

MSRP: USD $249.95

USD $233.96

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