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SKU: 3131-12
GSC P-D Toyota/BMW B58/S58 Manganese Bronze EX Valve Guide w/Stopper - Set of 12
GSC Power-Division exhaust valve guides feature manganese bronze construction with integrated stoppers for BMW B58 and S58 engines in models like 3 Series M340i Toyota GR Supra and M3/M4. This set of 12 replaces stock guides to handle extreme heat and boost levels in performance builds. Engineered for precise fit and long-term durability under racing conditions.
Key Features
- Manganese Bronze Material: Resists galling and wear in high-temperature exhaust ports while providing excellent thermal conductivity for consistent valve operation
- Integrated Stopper: Locks guides in place to prevent axial movement and ensure repeatable valve stem alignment during high-rpm use
- Precision Tolerances: Machined to OEM-spec inner diameters for drop-in compatibility with GSC valves and stems on B58/S58 heads
- Complete Set of 12: Full engine coverage for inline-6 cylinder heads saving time on rebuilds
- Performance Focused Design: Developed for turbocharged applications exceeding 30psi boost with proven results in drag and circuit racing
Product Notes
- Exhaust side only guides measure 7mm ID x 16.5mm OD x 46.6mm length
- Inspect cylinder head valve seats before installation for proper guide height
- Packed in protective tube to prevent damage during shipping
Installation Notes
- Professional installation recommended.
- Requires GSC valve guide driver tool or equivalent for press-fit installation
- Compatible with stock or oversized GSC exhaust valves 6mm 7mm stems
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2020+ | Toyota | GR Supra | 3.0T B58 |
| 2016+ | BMW | 3 Series | 340i M340i B58 |
| 2017+ | BMW | 5 Series | 540i M550i B58 |
| 2018+ | BMW | X3 | M40i B58 |
| 2018+ | BMW | X4 | M40i B58 |
| 2019+ | BMW | X5 | xDrive40i B58 |
| 2019+ | BMW | Z4 | M40i B58 |
| 2021+ | BMW | M3 | S58 |
| 2021+ | BMW | M4 | S58 |
| 2022+ | BMW | X3 M | S58 |
Why Choose GSC Power-Division?
- Proven in professional motorsports from NHRA to endurance racing
- USA-made components with tight tolerances for reliability
- Extensive testing on dyno and track for B58/S58 platforms
Frequently Asked Questions
-
Q: Will these fit 2020+ Toyota GR Supra B58 engine?
A: Yes direct fit for all 2020+ Toyota GR Supra 3.0T models using B58 engine with no modifications -
Q: What is the material and why manganese bronze?
A: Manganese bronze offers high strength low friction and superior heat transfer ideal for exhaust guides in turbo engines preventing seizure under boost -
Q: What warranty applies and installation tips?
A: GSC provides 1-year warranty against defects professional installation with proper tools recommended ream seats if reusing
Shipping & Handling
- Method: UPS Ground / USPS Priority
- Availability: In stock - ships same or next business day
- Packaging: Protective cardboard tube 8x2x2 inches
- Weight: 0.4 lbs
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