911 Design Performance Store | 911 Design – Montclair, CA

Genuine High-Performance Aftermarket Parts & Upgrades

At 911 Design, performance isn’t a trend, it’s our foundation. Built on years of hands-on Porsche experience and deep roots in motorsports, we’ve earned a reputation for doing things the right way: with precision, integrity, and an uncompromising standard for quality.

Now, we're your destination for premium aftermarket Porsche parts and upgrades — from engine performance and drivetrain to suspension, wheels, interior, and accessories. Every product we offer is carefully selected for fit, function, and driving impact, and can be installed by our expert technicians with the same level of care and detail you deserve.

Our popular exhaust catalog features SOUL Performance — one of the most respected names in Porsche performance exhaust — covering full exhaust systems, headers, muffler bypasses, and cat bypasses for the 993, 997, 991, and 992 chassis including GT3, Carrera, and Turbo variants.

We have also partnered with Triebwerk as their exclusive distributor for North America and South America. From fan heaters to valve covers to phone mounts, Triebwerk products are born from German-engineered precision to provide you with only the best experience. 

Professional Installation Service For Your Porsche Parts

Based in Montclair, CA our expert Porsche technicians can also install everything in our shop. We are just a call or message away to help you choose with confidence.

Sharkwerks titanium GT3 exhaust system for Porsche 992.

PERFORMANCE

EXHAUST
INTAKE
HEADERS
COOLING & HEATING
VALVE COVERS
ENINGE MANAGEMENT / TUNING

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Two Ohlins Road And Track coilovers for Porsche on white background.

SUSPENSION

COILOVERS
SPRINGS
SHOCKS
CAMBER PLATES / LINKAGE
CHASSIS (CAGES / BRACES)

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Volk Racing TE37 Saga S-Plus in bronze almite on white background.

WHEELS

STREET
MOTORSPORT
OFF-ROAD
WHEEL ACCESSORIES

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Recaro Sportster racing seat on a white background.

INTERIOR

SEATS
STEERING WHEELS
SHIFT KNOBS
HARNESS
DRESS UP & STORAGE

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Numeric Short Throw Shifter component in black with white Numeric logo on a white background.

DRIVETRAIN

SHIFTERS
CLUTCHES
FLYWHEELS

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Triebwerk DTW magnetic wireless charging phone mount on white background

ACCESSORIES

PHONE MOUNTS
APPAREL

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Why Buy Parts from 911 Design?

Can 911 Design install the parts I purchase from the store?

Yes. Every part in our catalog can be professionally installed by our Porsche-trained technicians at our Montclair, CA facility. If you're purchasing a part and want it installed, contact us when placing your order and we'll coordinate both at the same time.

Are the aftermarket parts you sell compatible with my specific Porsche model?

All parts in our catalog are listed with compatible chassis designations [993, 996, 997, 991, 992, and others] so you can shop by model. If you're unsure whether a part fits your specific year or variant, our team is available by phone or message to confirm fitment before you order.

Do you carry parts for both street-driven and track Porsches?

Yes. Our catalog covers the full spectrum: from street-legal bolt-on upgrades like exhaust systems and coilovers, to motorsport-grade components including competition headers, racing seats, and harnesses. Whether you're building a weekend driver or a dedicated track car, we carry parts suited to your build.