GSC Power-Division Viton® Exhaust Valve Stem Seals – GSC1089 (Toyota Supra / BMW B58 & S58)
Crafted for turbocharged engines operating under extreme conditions, the GSC1089 Viton® Exhaust Valve Stem Seal Kit is built for Toyota and BMW platforms running B58 and S58 powerplants. Made with genuine DuPont Viton® fluoroelastomer, these seals offer exceptional resistance to heat, fuel, and chemical exposure—making them ideal for high-RPM and long-mileage builds.
GSC Power-Division applies advanced material standards to ensure minimal wear and maximum durability. Unlike lower-grade alternatives, this kit includes seals for both intake and exhaust valves, delivering full coverage without compromise. Whether you're chasing horsepower or reliability, these seals outperform OEM options at a fraction of the cost.
Compatible Applications:
- Toyota Supra B58
- BMW B58
- BMW S55
- BMW S58
Kit Includes:
- Set of 12 Exhaust Valve Stem Seals (6mm stem diameter)
Fitment:
- 2016–2025 Toyota Supra 3.0L B58
- 2016–2025 BMW 340i / M340i 3.0L B58 (G20, F30)
- 2016–2025 BMW Z4 3.0L B58 (G29)
- 2015–2020 BMW M2 Competition 3.0L S55
- 2015–2020 BMW M3 3.0L S55 (F80)
- 2015–2020 BMW M4 3.0L S55 (F82/F83)
- 2020–2025 BMW M3 3.0L S58 (G80)
- 2020–2025 BMW M4 3.0L S58 (G82/G83)
- 2023–2025 BMW XM 3.0L S58 Hybrid
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