There are places in a turbo system where you want heat, and places where you do not. From the exhaust ports to the turbine wheel, keeping heat in the piping and turbine helps preserve the thermal energy that drives the turbo. After that, insulation also helps control radiant heat so wiring, plumbing, and other nearby parts are not getting cooked. That is the real job of turbo insulation: keep energy where it does useful work, and keep unwanted heat away from everything around it. On the Duramax L5P and the twin-turbo supercharged Duramax build in our dyno cells, that means insulating the up-pipes feeding the turbochargers and covering the turbine housings themselves. The other point that matters is material capability. With any thermal product, the continuous temperature rating is the number that tells you whether it can survive real sustained load. And if you wrap exhaust parts tightly with highly effective insulation, the tubing underneath needs to be up to the job. Thin, low-grade pipe can overheat when too much heat is trapped in the system.
The episode opens with a simple engineering point: in an engine system, some areas need heat retained while other areas need protection from that heat. Gale frames the problem around two active Banks engine programs. One is a monster-truck build using both twin turbochargers and a supercharger in dyno cell one. The other is an L5P Duramax program in dyno cell two that he describes as an effort to push the engine to failure. Both projects need thermal control, but for slightly different reasons.
On the hot side before the turbocharger, the goal is to keep heat inside the exhaust piping and turbine housing so that thermal energy reaches the turbine wheel instead of being lost to the engine bay. After the turbine, the concern shifts toward radiated heat and preventing damage to nearby wiring, plumbing, and other components. That distinction sets up the rest of the video: insulation is not just about lowering underhood temperature, but about placing heat where it helps performance and keeping it away from parts that can be harmed by it.
The thermal materials in the video come from Heatshield Products in Escondido. Gale notes that the company is another family-run operation, something he says he has repeatedly encountered throughout his career. He reflects on how unusual long-lived companies are, pointing out that many businesses do not survive even five or ten years, while only a small number make it to 50 or 100 years. He uses that observation to emphasize the value of multi-generational companies that preserve their original purpose and standards.
Heatshield Products was founded in 1985 by Mel Heye. According to Gale, Mel's son Bruce was involved from the beginning, and Bruce's son Steve later joined the business. Today, Bruce and Steve run the company, and Gale says they have been at it for 35 years. After explaining the needs of the Banks projects to Steve and describing how the materials would be applied, Gale received a shipment tailored to those applications.
The first major item in the box is a Lava Turbo Heat Shield for the turbine housing. Gale immediately stresses an important point about thermal products: buyers need to distinguish between momentary temperature ratings and continuous temperature ratings. Many products advertise only the short-duration number, but for real engineering use both values matter.
For this turbo blanket, the stated ratings are 1,800 degrees Fahrenheit continuous and 2,200 degrees Fahrenheit for up to 30 seconds. Gale notes that a 30-second rating can cover many motorsports situations such as drag racing, truck pulling, and tractor pulling, where exposure to peak heat may be brief. For sustained-duty events such as Pikes Peak, however, the continuous rating becomes the critical specification. His point is that thermal protection should be selected according to actual duty cycle, not just the highest number printed on the package.
Gale then breaks down the turbo blanket as a three-layer construction rather than a single chunk of insulating material. The inner layer is called the mat, the middle layer is the core, and the outer layer is the shield. He also mentions that Heatshield Products offers a Stealth version using essentially the same materials but with a proprietary black exterior coating.
The inner mat uses the company's Inferno Mat material, described as a broken-twill silica fabric with a melting point of 3,000 degrees Fahrenheit. The core is called Inferno Core, an inorganic high-temperature needle blanket presented as an alternative to ceramic fiber, with a 2,000 degree Fahrenheit service temperature rating. Gale explains why that matters: the layer touching the turbine housing sees the most severe thermal environment, so it must resist degradation while absorbing direct radiant heat from the turbine.
The outer layer, called Lava Shield, is made from basalt. Gale highlights basalt's volcanic origin and notes that the material is impervious to gasoline, acid, and other contaminants. In his view, the layered design is what makes the blanket technically interesting: the hottest-facing layer survives direct exposure, the intermediate structure insulates, and the outer shell provides durability and environmental resistance.
The turbo blanket includes Inconel wire and anchor points that allow the installer to tension the blanket across the turbine inlet and secure it around the housing. Gale points out two anchors on one side and one on the other, which provide adjustability when tightening the assembly. The use of Inconel for the wire is appropriate for the heat involved, since ordinary fastening materials would not tolerate turbine-housing temperatures for long.
The blanket shown is sized for what the industry still calls a T4 turbocharger. Gale explains that these T-size references go back decades to common Garrett frame sizes that enthusiasts and builders still use as shorthand. In his description, T6 refers to a relatively large turbocharger, T4 to a medium size commonly associated with older twin-turbo small-block Chevrolet combinations, and T3 to a smaller size used on later-model smaller engines. He notes that even larger sizes exist, and says Heatshield Products also does custom work for unusually large turbochargers such as those used in tractor pulling. The broader point is that the company is not limited to one standard catalog size.
Gale summarizes the function of the turbine blanket in straightforward thermodynamic terms: an insulator keeps heat in. On a turbocharged engine, that retained heat energy is valuable because it helps drive the turbine. He wants the thermal energy preserved from the exhaust ports all the way to the turbine wheel rather than being lost through radiation from the manifolds, up-pipes, and turbine housing.
That same insulation also protects surrounding components. In other words, the blanket serves two purposes at once. It improves the energy delivered to the turbocharger while reducing the heat load imposed on nearby engine-bay parts. This is why the pre-turbine side of the system gets special attention in both Banks projects.
For the exhaust piping feeding the turbochargers, Heatshield Products supplied a different material called Heat Shield Armor. Gale describes it as a wrap unlike the conventional exhaust wraps he has seen before because it combines insulation with a reflective exterior. The sample in the box is a half-inch-thick version, and he notes that the product is available in multiple thicknesses and widths.
Heat Shield Armor is described as an inorganic high-temperature needled blanket, again positioned as an alternative to ceramic fiber, with a maximum temperature rating of 1,800 degrees Fahrenheit. Gale also identifies it as a bio-soluble Viton resin silica-cut fiber mat. His main takeaway is that the material insulates extremely well. In fact, he warns that on poor-quality thin-wall exhaust parts, especially the thin imported tubing often used in low-cost systems, wrapping the pipe too tightly with such an effective insulator can trap enough heat to damage or melt the tubing. Because Banks typically uses thicker-wall 409 stainless or 304 stainless, he is less concerned about that problem on their own hardware.
One detail he finds especially surprising is that the exterior of the wrap can be painted with engine paint. He does not plan to do that here, but he treats the claim as evidence of the material's temperature capability, since he has not previously encountered an exhaust insulation product intended to be painted on the outside. In this application, the wrap will be used on the up-pipes running from the exhaust manifolds to the turbochargers, including the piping on the Duramax project.
The box also includes the hardware needed to install the wrap cleanly and securely. Gale shows stainless thermal ties that function like oversized tie-wraps. They are 5/16 inch wide, 14 inches long, and made from 318 stainless. He sees them as a good match for fastening the Heat Shield Armor around the piping.
Another fastening option in the kit is the Power Anchor system. These anchors are riveted in place with backing plates, so installation requires a pop-rivet tool. Once mounted, the anchors work with the supplied 20 feet of Inconel wire to lace and secure the insulation. Gale compares the hooks to hardware familiar from military combat boots and describes the result as a more refined way to assemble and tension the shielding. The emphasis here is that the insulation system is not just raw material; it includes purpose-built attachment hardware for durable installation in high-heat environments.
By the end of the unboxing, Gale has identified how each product will be used. The Lava Turbo Heat Shield will go on the turbine housing to retain heat at the turbocharger itself. The Heat Shield Armor wrap will be applied to the up-pipes feeding the turbo, where preserving exhaust heat before the turbine is especially important. The stainless ties, Power Anchors, and Inconel wire provide the means to secure everything properly.
The immediate plan is to take the materials to dyno cell two and begin wrapping the Duramax. That closes the engineering overview for this segment: the video is less about cosmetic heat shielding and more about selecting materials by temperature rating, layer construction, and installation method so the hot side of a turbo system keeps its energy where it is useful and limits collateral heat elsewhere in the vehicle.