Put an aftermarket header on a 2008-2021 STI and you quietly delete a piece of heat protection nobody mentions in the install video. The factory header carries its own built-in shielding, and part of what that shielding covers is the right-hand exhaust AVCS solenoid and cam sensor wiring sitting directly above it. Pull the header and that protection leaves with it. What is left over those connectors is a small ABS plastic shroud Subaru designed to keep road debris off, not heat, and in many cases it simply melts. The OVERTAKE DAVCS Cam Solenoid Heat Shield puts a 1.5mm 304 stainless steel barrier back between your header and that harness. It bolts to two factory mounting points using hardware already on the car, and a pre-cut gold heat reflective barrier layers over the stainless for a second line of defense. Fits 2008-2021 Subaru STI.
If you already know exactly what this is because you have seen your own melted shroud, the DAVCS Cam Solenoid Heat Shield for the 2008-2021 STI is in stock here. If you are still working out whether your car needs one, here is what is actually happening under that header.
What Does an Aftermarket Header Do to Your AVCS Wiring?
The 2008-2021 STI runs Dual AVCS, meaning the ECU phases both the intake and exhaust camshafts. On the right-hand side of the engine, the exhaust AVCS solenoid and cam sensor connectors sit directly above the header. Subaru knew that, and the factory solution was to build shielding into the header itself.
That design decision has a consequence most people never think about. Because the header was doing the heat work, the cover Subaru put over the connectors never had to. It is ABS plastic, and its actual job is splash and road debris. It was never a heat shield in any meaningful sense.
Swap to an aftermarket header and the shielding walks out the door with the factory piece. Now a thin wiring harness and a set of connectors are sitting over the hottest section of your exhaust with a plastic cover that was never engineered for the assignment. The failure is not dramatic. Nothing announces itself. You find it the next time you are down there for something else and notice the shroud has gone soft, sagged, or started to deform against the header.
That is the gap the OVERTAKE shield closes.
How the OVERTAKE Shield Rebuilds the Barrier
The design goal was straightforward: put back the thermal separation the header install removed, then add a layer the factory never had in the first place.
1.5mm 304 Stainless, CNC-Formed
The shield is CNC-formed from 1.5mm 304 stainless steel in a brushed finish, shaped to close off the pocket where those connectors live. The result is a separate thermal chamber between the header and the electronics rather than a flat plate hung in the general vicinity. It is formed to clear most aftermarket headers, which matters because header geometry in this space varies more than people expect.
There is a stamped, raised OVERTAKE logo on the face. Small thing, but it is the difference between a part that looks like it belongs in a built engine bay and a part that looks like a bracket.
The Gold Heat Reflective Barrier
Stainless is good at blocking conducted heat and mediocre at dealing with radiant heat, which is most of what a header throws at anything above it. The kit includes a pre-cut gold heat reflective barrier shaped to the contours of the shield, so it follows the formed geometry instead of leaving flat foil bridged across the curves. It turns radiant heat back before it reaches the steel.
It comes in the box. Nothing extra to source, nothing extra to trim.
Does It Fit Your STI?
Fitment on this one is narrow on purpose. The Dual AVCS layout and the mounting geometry are specific to this generation of the EJ257.
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Subaru STI - 2008 through 2021
It is designed to fit alongside most aftermarket headers. It replaces Subaru OEM part number 24035AA000, the ABS shroud that came on the car from the factory.
Who Actually Needs One of These?
Honest answer, because not everybody does.
If you are running an aftermarket header, this is the part. The protection your car left the factory with is gone and the plastic cover on those connectors is not a substitute for it. Whether the shroud has already deformed or not is mostly a question of how long the header has been on and how hard the car gets driven.
If you are planning a header, buy them together. Installing the shield at the same time as the header is the easy version of this job, because both mounting points are wide open while the exhaust is off the car.
If you are fully stock, you do not need this yet. The factory header is still carrying its own shielding and doing the job Subaru designed it to do. Put this on the list for whenever the header goes on, not before.
And if you are looking at a shroud that has already melted, replacing plastic with more plastic just resets the same clock.
Installation: Two Bolts and the Hardware Already on Your Car
The shield mounts at two points: the lower side of the timing cover, and the back side of the exhaust AVCS solenoid bracket. It reuses OEM hardware, so there are no fasteners to source and nothing extra in the box to lose.
If you are installing at the same time as the header, the shield just bolts into place while you have clear access.
If the header is already on the car, you can usually slip the shield up from below the frame rail and secure it to the same two points. No pulling the exhaust back off for this.
Does It Match the Rest of Your Engine Bay?
The brushed finish and the raised logo are the same treatment used on the OVERTAKE Turbo Heatshield for EJ cars, so if you already run one of those the two parts read as a set rather than as two unrelated pieces of stainless. Same material, same finish, same logo. For anyone building a bay where the details line up, that consistency is worth something.
LINK 3 (related product, optional third link): anchor text "the OVERTAKE Turbo Heatshield for EJ cars" links to https://overtakeusa.com/products/overtake-turbo-heatshield-subaru-2002-2014-wrx-2004-2021-sti-2004-2013-forester-xt-2005-2009-outback-xt-2005-2009-legacy-gt
Ready to Get Header Heat Off Your AVCS Wiring?
The OVERTAKE DAVCS Cam Solenoid Heat Shield is in stock now for the 2008-2021 STI, gold barrier included. Grab yours before the next heat cycle.
Frequently Asked Questions
Will this fit my 2015 STI?
Yes. The shield fits 2008 through 2021 STI. That covers both the 2008-2014 and 2015-2021 chassis, since the Dual AVCS layout and the mounting points on the EJ257 carried across both.
Do I need this if I still have the factory header?
No. The factory header has shielding built into it that protects the exhaust AVCS solenoid and cam sensor connectors. This shield exists to replace that protection once an aftermarket header removes it. If your car is stock in that area, you are already covered.
What OEM part does this replace?
Subaru part number 24035AA000, the ABS plastic shroud over the right-hand cam sensor and AVCS solenoid connectors. If you have searched that part number because yours melted, this is the part you are actually looking for.
Do I have to take my header off to install it?
Usually not. With a header already on the car, the shield can typically be slipped into position from below the frame rail and bolted to the two factory mounting points. If you are installing a header anyway, doing both at once is easier because the access is already there.
Does the gold heat reflective barrier come in the box?
Yes. The kit includes the shield and a pre-cut gold heat reflective barrier shaped to the contours of the shield. Worth stating plainly because the gold foil for the OVERTAKE Turbo Heatshield is sold as a separate part. On this one it is included.
