TGK Motorsport Audi 4.0T BOV Spacer Kit

    TGK Motorsport Audi 4.0T BOV Spacer Kit

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    Overview

    The Audi 4.0T TFSI — found in the S6, S7, S8, A8, RS6, RS7, and related VW Group platforms — is one of the most pressure-intensive twin-turbocharged engines in production. When enthusiasts upgrade to a Wagner Tuning charge cooler for improved intercooling efficiency, they immediately run into a frustrating dimensional mismatch: the stock blow-off valve port geometry does not align with the Wagner unit's charge pipe outlet, making it impossible to run an upgraded BOV without a precision adapter solution. Band-aided fixes using off-the-shelf hardware introduce boost leaks, charge pressure drop, and potential compressor surge — all of which kill consistency on high-horsepower 4.0T builds.

    The TGK Motorsport Audi 4.0T BOV Spacer Kit eliminates that mismatch entirely. Machined from aerospace-grade 6061 billet aluminum, these precision spacers bridge the TGK BOV directly to the Wagner Tuning charge cooler with zero compromise in sealing integrity. Each kit ships complete with a purpose-cut gasket and all required hardware, so installation is clean, permanent, and boost-proof — no improvised adapters, no leaks, no excuses.

    Specifications
    Part number TGK-0302-02
    Compatible vehicles Audi S6, S7, S8, A8, RS6, RS7, RS6 Avant, A6, A7 & related VW Group platforms equipped with the 4.0T TFSI (CEU, CES, CVU, CVK, CTGE engines) paired with Wagner Tuning charge cooler
    Material 6061 Billet Aluminum
    Hardware included Yes — spacers, gasket & mounting hardware
    Warranty Lifetime structural warranty
    Features & Benefits
    ✓
    Precision Billet MachiningCNC-machined from 6061 billet aluminum to exact tolerances, ensuring a flush, rattle-free fit between the TGK BOV and Wagner Tuning charge cooler on every Audi 4.0T application.
    ✓
    Leak-Free SealingPurpose-cut gasket included in the kit creates a dead-seal interface at boost, eliminating charge pressure loss and compressor surge events that plague generic adapter solutions.
    ✓
    Complete Hardware KitEvery bolt, spacer, and gasket needed for a full installation ships in the box — no hardware store runs, no sourcing headaches, no missing pieces.
    ✓
    Wagner Cooler CompatibleEngineered specifically around the Wagner Tuning charge cooler outlet geometry for Audi S6, S7, S8, RS6, and RS7 platforms — no modifications to the cooler or charge pipes required.
    ✓
    Corrosion-Resistant Finish6061 aluminum naturally resists heat cycling, oil contamination, and under-hood corrosion, keeping the spacer structurally sound across the life of the build.
    ✓
    Lifetime Structural WarrantyTGK backs this kit with a lifetime structural warranty — because a machined billet adapter should never be a point of failure on a high-horsepower 4.0T build.
    Frequently Asked Questions
    Which Wagner Tuning charge cooler is this BOV spacer kit designed for?
    This kit is engineered specifically to work with the Wagner Tuning competition charge cooler designed for Audi 4.0T TFSI platforms including the S6, S7, S8, RS6, RS7, and A8. If you are running a different intercooler brand or a stock cooler, fitment cannot be guaranteed — contact TGK Motorsport before ordering.
    Do I need to modify the Wagner charge cooler or charge pipes to install this kit?
    No. The TGK 4.0T BOV Spacer Kit is designed as a bolt-on solution. The billet spacers and included gasket bridge the gap between the TGK BOV and the Wagner cooler outlet without requiring any drilling, cutting, or modification to your existing intercooler or charge pipe routing.
    Is all mounting hardware included in the kit?
    Yes. Each TGK BOV Spacer Kit ships complete with the billet 6061 aluminum spacers, a purpose-cut sealing gasket, and all mounting hardware required for installation. Everything you need to complete the job is in the box.
    Will this spacer kit work with other BOV brands, or only the TGK BOV?
    This kit is dimensionally matched to the TGK Motorsport blow-off valve and the Wagner Tuning charge cooler. It is not intended for use with third-party BOVs such as Turbosmart, HKS, or Forge units, as bolt patterns and port diameters will differ. For the best results, pair this spacer kit with the TGK Motorsport Audi 4.0T BOV.
    What warranty does the TGK Motorsport BOV Spacer Kit carry?
    The TGK Motorsport Audi 4.0T BOV Spacer Kit is backed by a lifetime structural warranty. TGK stands behind the integrity of every billet component we manufacture. If a spacer fails due to a material or machining defect at any point, we will make it right.

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