OE Ultimate Under Supercharger Kit (Audi EA837 B8 and C6 3.0T Gen 1, 06E103547AC PCV)

Vorsprung Autowerk Ultimate Under-Supercharger Service Kit (Gen 1 EA837 B8 and C6 3.0T)

Don’t pull the supercharger twice. Do it once, and do it right.

If you are removing the supercharger on your Gen 1 Audi 3.0T to replace a failing thermostat or PCV valve, replacing the rest of the critical "under-blower" components while you're in there isn't just recommended, it's mandatory.

The factory plastic cooling components are notorious failure points that leave drivers stranded and facing massive labor bills. The Vorsprung Autowerk Ultimate Under-Supercharger Service Kit bulletproofs the valley of your 3.0T. We've taken the guesswork out of this heavy-duty maintenance job by assembling the highest-quality OEM, OES, and upgraded metal components on the market. This is the most complete kit on the market!

Say goodbye to cracking plastic housings and leaking seals. This kit is designed for enthusiasts who demand peak reliability for their daily drivers or stage-tuned track weapons.

Kit Includes:

• Complete Vorsprung Billet Thermostat Housing and Thermostat - the full billet aluminum housing with the thermostat included, not just the housing (Replaces OEM 06E121111AL)
• URO Parts Aluminum Heater Pipe - Eliminates plastic pipe (Replaces OEM 06E121065N)
• Graf Metal Water Pump - OEM quality replacement (Replaces OEM 06E121018A)
• OEM Hengst PCV Valve - (06E103547AC)
• Elring Upper Intake Manifold Gaskets (x6) - (079129717D)
• Elring Lower Intake Manifold Gaskets (x6) - (079129717B)
• Genuine VW/Audi PCV to Supercharger Adapter Pipe - (06E103213)
• Elring Klinger Fuel Injector Seal Kit (x6) - (06E998907E)
• Audi Engine Crankcase Breather Hose - OEM (06E103207P)
• Audi Breather Hose Clamp - (N10203601)

Under Supercharger Kit FAQ

What's included in this Audi B8 under supercharger kit?
The complete billet aluminum thermostat housing and thermostat, URO Parts aluminum heater pipe, Graf metal water pump, OEM Hengst PCV valve, Elring upper and lower intake manifold gaskets, the PCV-to-supercharger adapter pipe, an Elring injector seal kit, and the breather hose and clamp hardware. Full part numbers are listed above.

Does the kit include just the billet thermostat housing, or the thermostat too?
Both. You get the complete billet aluminum thermostat housing and the thermostat as one assembly, so there is no separate thermostat to buy.

This kit already includes an OEM breather hose. Can I buy that part on its own?
Yes. The Audi Engine Crankcase Breather Hose in this kit is genuine OEM part 06E103207P. If you want a spare on hand, or need to order it separately down the road without buying the whole kit again, see our standalone genuine 06E103207P PCV pipe listing.

Is this the right kit for my early 3.0T, or do I need the B8.5 kit?
This kit is scoped to the earliest Gen 1 EA837 3.0T applications: 2010-2012 S4, 2010-2012 S5 Cabriolet, and 2009-2011 C6 A6. The 2011-2015 4L Q7 3.0T uses PCV valve 06E103547AK and needs our C7 A6, A7 & 4L Q7 kit. If your Audi is a 2013 or newer B8.5 or D4 model, use the B8.5 Ultimate Under Supercharger Kit instead, it has different part numbers for the water pump and PCV valve.

Do I need to replace every part in the kit, or just the one that failed?
Once the supercharger is off the car, the labor to remove and reinstall it is the expensive part, not the parts themselves. Replacing the whole valley now means you won't be paying for that labor twice.

Are these OEM parts or aftermarket?
Both. This kit mixes genuine OEM hardware with trusted OE-supplier brands (Graf, Hengst, Elring, URO) and a Vorsprung-engineered billet aluminum thermostat housing in place of the factory plastic piece that tends to crack. From time to time we may need to substitute gaskets for another OE equivalent due to supplier shortages , but we will never substitute hard parts.

A Word on Why This Kit Doesn't Cost What You'd Expect

A full under-supercharger kit with this much parts content should, on paper, cost more than it does. The reason it doesn't isn't that we cut something out, it's that we didn't mark up every single line item 50-100% the way a lot of bundled kits do. Ten parts at a 75% markup each adds up fast, and none of that extra margin makes the water pump spin any better.

We priced this kit off what the components actually cost to source and assemble, not off what the market would tolerate charging for convenience. Every OEM and OE-supplier part in this kit is the exact same part number you'd get anywhere else; we just didn't stack a markup on top of a markup ten times over.

• Real Part Numbers, Real Sources: Genuine OEM hardware and trusted OE-supplier brands, not unbranded substitutes.
• One Reasonable Markup, Not Ten: We price the kit as a kit, not as several separately-inflated line items bundled together.
• No Convenience Tax: You're paying for the parts and the R&R this kit saves you, not for someone else's margin stack.

Bottom line: a lower price on a complete kit isn't a sign that something's missing, it's a sign that nobody padded the invoice on the way to your cart.

Complete Your Build

Already in the valley? Pair your kit with:

• Genuine Audi PCV Pipe (06E103207P) — already included in this kit; order a spare or replace it again down the road without buying the full kit.
• Billet Supercharger Tensioner Pulley — replace the factory plastic tensioner while the belt is off
• Unzerstörbar Crank Pulley Bolt Kit — high-strength hardware for the crank pulley you'll be accessing
• TruDrive Crank Pulley — raise supercharger speed while everything is apart
• Sehr Gut Intercooler Port Upgrade Kit — upgrade the intercooler ports in the same service window
• Shop all Under Supercharger Kits — wrong platform? Find the right fitment for your Audi 3.0T

Drive the difference. Drive Vorsprung.