Under Supercharger Kit (Audi 3.0T Gen 1 B8.5)
Under Supercharger Kit (Audi 3.0T Gen 1 B8.5)
Regular price
$864.99
Sale price
$864.99
Regular price
$886.99
Unit price
per
Shipping calculated at checkout.
Couldn't load pickup availability
- Fully secure checkout
- Trusted by thousands
- Rated and reviewed
Documentation
Question about this product?
We're happy to help.
Up to 2% off
Overview
Everything you need for supercharger-off service on your Audi B8.5 S4, S5, Q5, or SQ5. This comprehensive kit includes a GPS billet aluminum thermostat assembly, aluminum heater pipe, Graf metal water pump, OEM PCV valve, and all critical gaskets and seals that should be replaced when accessing the valley of your 3.0T TFSI engine.
When removing your supercharger for carbon cleaning, thermostat replacement, coolant leak repair, or performance upgrades, these are the parts you should replace while you have access. The B8.5 platform commonly develops coolant leaks from the thermostat housing and heater pipe, while intake manifold gaskets and PCV components deteriorate over time. This kit bundles everything in one package, preventing the need for a second teardown. Common reasons for supercharger removal include: coolant leaks in the engine valley (thermostat, heater pipe), intake valve carbon cleaning, PCV system failure causing oil consumption, rough idle from worn intake manifold gaskets, and ported blower installation or pulley upgrades.
Specifications
| Application | Audi B8.5 3.0T Gen 1 Supercharged TFSI |
| Compatible Vehicles | Audi S4, S5, Q5, SQ5 (B8.5) |
| Compatible Engine Codes | CAKA, CCAA, CGWB, CGXC, CTUA, CTUB |
| Thermostat Assembly | GPS Billet Aluminum Upgrade — Replaces OEM 06E121111AL |
| Heater Pipe | Aluminum (eliminates plastic failure point) — Replaces OEM 06E121065N |
| Water Pump | Graf Metal OEM-Quality Replacement — Replaces OEM 06E121018N |
| PCV Valve | OEM Hengst — 06E103547AH |
| Upper Intake Manifold Gaskets | Elring (x6) — 079129717D |
| Lower Intake Manifold Gaskets | Elring (x6) — 079129717B |
| PCV to Supercharger Adapter Pipe | Genuine VW/Audi — 06E103213 |
| Fuel Injector Seal Kit | Elring Klinger (x6) — 06E998907E |
| Optional Add-On | OEM Audi Crossover Pipe — 06E121045BB |
Features & Benefits
✓
Billet Aluminum Thermostat AssemblyGPS billet aluminum thermostat replaces the failure-prone OEM plastic housing, eliminating a leading source of coolant leaks in the B8.5 engine valley.
✓
Aluminum Heater Pipe UpgradeAluminum heater pipe replaces the OEM plastic unit, removing a known failure point that commonly causes coolant leaks requiring full supercharger removal to access.
✓
Graf Metal Water PumpOEM-quality Graf metal water pump replaces OEM 06E121018N, providing reliable coolant flow without the longevity concerns of plastic impeller units.
✓
Complete Gasket & Seal CoverageElring upper and lower intake manifold gaskets (x6 each) and an Elring Klinger fuel injector seal kit (x6) cover every critical sealing surface exposed during supercharger removal.
✓
OEM & OEM-Equivalent Parts OnlyEvery component is sourced from OEM suppliers including Hengst, Elring, Elring Klinger, Graf, and Genuine VW/Audi — no aftermarket substitutes.
✓
One-Visit Service SolutionBundles all parts that should be replaced during a single supercharger-off service, whether for carbon cleaning, ported blower installation, or preventive maintenance — no costly second teardown.
Frequently Asked Questions
Which vehicles is this kit compatible with?
This kit fits Audi B8.5 S4, S5, Q5, and SQ5 models equipped with the Gen 1 3.0T supercharged TFSI engine. Compatible engine codes are CAKA, CCAA, CGWB, CGXC, CTUA, and CTUB.
Why do I need to replace all of these parts at once?
Accessing the engine valley on the 3.0T requires full supercharger removal — a significant labor investment. The thermostat housing, heater pipe, intake manifold gaskets, PCV components, and injector seals are all located in this area and commonly deteriorate together. Replacing them in a single service prevents a second teardown if any of these parts fail shortly after.
What is the optional OEM Audi Crossover Pipe and do I need it?
The OEM Audi Crossover Pipe (06E121045BB) is an optional add-on for a complete cooling system refresh. It is recommended if your crossover pipe shows signs of wear or if you want to fully address all cooling components while the supercharger is already removed.
Is this kit suitable for a DIY install?
Yes. This kit is well-suited for experienced DIYers performing carbon cleaning, ported blower swaps, or preventive maintenance. The kit provides every part needed for a complete supercharger-off service so no additional sourcing is required mid-job.
Are the thermostat assembly and heater pipe upgrades over OEM?
Yes. The GPS billet aluminum thermostat assembly and aluminum heater pipe are direct upgrades over the original plastic OEM components. Both eliminate known failure points that commonly cause coolant leaks on the B8.5 platform.
