The F-hose is the branched vacuum line on the RS4 2.7 BiTurbo, and the factory rubber version cracks with age, which bleeds off boost control vacuum and upsets the signal to the wastegate and diverter valves. This replacement is moulded in high quality silicone with three to five reinforcement layers, so it stays sealed under vacuum and underhood heat far longer than the original rubber. Matching hose clamps are sold separately as clamp-kit227.
Specifications
| Type | Silicone vacuum hose (F-hose) |
| Material | Silicone, three to five reinforcement layers |
| Color | Black |
| Part Number | do88-kit227S |
| OEM Replacement | 078133784BD |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2000-2002 | Audi | RS4 (B5) | quattro 2.7 BiTurbo |
Shipping
- In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
- Standard, expedited, and overnight options at checkout.
- Oversized items ship by freight and take longer.
- Backordered items ship as soon as stock lands — contact us for lead times.
- International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.
Returns
- 30-day returns on new, uninstalled items in original packaging with all hardware.
- Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
- Installed or used parts can’t be returned — confirm fitment before you install.
- Special orders and custom items are final sale.
- Email us for return authorization before shipping anything back.
Full details: Shipping Policy · Refund Policy
