What is a GR2 Titanium Flex Bellow?
GR2 refers to Grade 2 pure titanium, a commonly used pure titanium material with excellent corrosion resistance, good weldability, and moderate strength. GR2 titanium flexible corrugated pipes are generally used in applications requiring compensation for thermal expansion, vibration damping, and stress buffering. A Titanium Flex Bellow is constructed from corrugated titanium alloy sheets or pipe sections and possesses the following characteristics:
1. Absorbs thermal expansion and contraction – It compensates for length changes in pipes or exhaust systems caused by temperature variations.
2. Vibration damping and stress buffering – The corrugated structure mitigates vibration and mechanical stress.
3. Lightweight and corrosion-resistant – GR2 titanium has low density while offering strong resistance to oxidation, marine, and chemical corrosion.
Specifications & Applications of GR2 Titanium Flex Bellow
| Nominal ID | Metric Size | Typical Vehicle / Exhaust Type | Common Installation Position | Application Description |
|---|---|---|---|---|
| 2.5″ | 63.5 mm | Small-displacement NA engines, entry-level race cars | Exhaust manifold → mid-pipe | Vibration isolation and thermal expansion compensation in compact layouts |
| 2.75″ | 70 mm | 2.0–2.5L NA or mild turbo performance cars | Downstream of manifold / turbo area | Balanced flow capacity with good flexibility, common in track-focused builds |
| 3.0″ | 76.2 mm | Mainstream performance cars, full titanium exhaust systems | Manifold to mid-pipe connection | Most widely used size, ideal for high-temperature and high-vibration environments |
| 3.5″ | 89 mm | Large-displacement NA or high-boost turbo race cars | Turbo outlet → mid-pipe | Designed for high exhaust flow, reduces stress on flanges and welds |
| 4.0″ | 101.6 mm | High-horsepower turbo race cars / professional motorsport | Mid-pipe section in custom systems | Suitable for extreme flow rates, typically used in custom racing exhaust systems |
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