Applications

Built for One System. Coming for Every Shifter.

ShiftMass™ is a modular weight and head platform. One base, one ring set, any head — tuned for your car. We launched with some of the most-requested Subaru and Toyota fitments. 

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Shipping Now — Subaru & Toyota Sport Compacts

Our Standard Lockout and Large Lockout Complete Systems are live today. Three head profiles (Orbit, Apex, Arc), eight weight settings each, and proper fitment for the factory reverse lockout — no adapters.

Standard Lockout fits:
- Subaru WRX 2015–2025 (6MT)
- Subaru STI 2004–2022
- Subaru BRZ 2013–2021 (Gen 1)
- Scion FR-S 2013–2016
- Toyota 86 / GT86 2013–2021
- Subaru Legacy GT Spec.B 2006–2012
- Subaru Forester XT 6MT 2014–2018

Large Lockout fits:
- Subaru BRZ 2022+ (Gen 2)
- Toyota GR86 2022+

Shop Complete Systems →

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Coming Soon

For: Ford Mustang 2015+ • Focus ST • Focus RS • Fiesta ST • Toyota GR Corolla • GR Yaris • Shelby GT350

 

Coming Soon #2 — Universal Shift Knob

For: Manual transmissions without a factory reverse lockout collar

Same ShiftMass head system. Same brass weight rings. A different base — threaded directly for the pitch your car uses, without a lockout cavity.

Thread pitches this round.
- M10x1.25
- M10x1.5
- M12x1.25
- M12x1.5
- 3/8-16

Good fits include:

- Classic American — Corvette, Camaro, Mustang pre-2005 (3/8-16 thread)
- Older Subaru 5MT — WRX, Impreza, Forester, Legacy
- Honda — S2000, Civic (non-Si/Type R), Integra, RSX
- Classic Japanese — Miata NA/NB/NC, 350Z, 370Z, MR2, Supra

Launching soon. Sign up below to hear first 

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Don't See Your Car?

Manual transmissions come in many thread pitches and shifter designs. If your car isn't listed above, tell us what you drive. Email zach@shiftmass.com with your year, make, and model — we keep a research list, and the right signal moves things forward.

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Hear It First

Drop your email in the signup at the bottom of the page to be notified when new ShiftMass products ship —Future head designs, and anything else in development. No spam. One email per release.

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ShiftMass isn't a generic weighted knob. Every product we ship is engineered for the specific factory shifter it fits — correct thread pitch, correct lockout fitment, correct gate pattern, correct feel. We'd rather be late than ship something that doesn't work right.

One base. One ring set. Any head. Your feel, your car, your range.

Street Machine Works — Patent Pending