Description
Premium aftermarket hot-side charge air cooler boot from Flex Technologies, a US silicone hose manufacturer in Gardena, California. Aramid-reinforced silicone rated to 500 F for the turbo-to-cooler run, with stainless steel retention rings moulded in.
Signs You Need a New Charge Air Boot
- Boost leak with noticeable power loss and poor throttle response
- Audible whistle or chuff at the joint under load
- Boot blows off under high boost, often after the clamp relaxes
- Silicone gone soft or swollen from turbo seal oil seepage
- Cracking or ply separation at the clamp bead
- Check engine light for boost pressure deviation or turbo underboost
Specifications
| Manufacturer | Flex Technologies |
|---|---|
| Part Number | CAC40-450X6 |
| Inner Diameter | 4.500 in |
| Length | 6.000 in |
| Configuration | Straight |
| Reinforcement | Aramid fiber, 4-ply |
| Maximum Temperature | 500 F |
| Color | Iron oxide |
| Retention Rings | Stainless steel, included |
| Weight | 0.60 lb |
| Side | Hot side (turbo outlet to charge air cooler) |
Cross References
This part replaces or is equivalent to the following part numbers:
- Flex Technologies: CAC40450X6
- TruckPro: NFCAC40-450X6
Applications
This boot is a universal cut-to-fit charge air connector, sold by inner diameter and length rather than by truck model. It fits the hot-side run from the turbocharger compressor outlet to the charge air cooler inlet on Class 6-8 trucks.
Do not substitute a blue CAC40P polyester boot on the hot side – polyester tops out at 350 F and fails early there. Measure the pipe OD and the gap between pipes before ordering.
