Heatshield Products reports that its I-M Shield will boost horsepower by lowering the intake manifold temperature by up to 40 percent.
The I-M Shield, which retails for under $100, adheres to the bottom of the intake manifold and creates a thermal barrier between it and the engine.
“Chassis dyno tests have shown an increase of nearly 20 rear-wheel horsepower, with a 10 horsepower and 15 foot pounds improvement across the entire power band,” a Heatshield representative reports.
I-M Shield features proprietary technology: a dense layer of high-temperature fiber material mated to a heat-reflecting surface.
Even though most late-model engine intakes are made from reinforced nylon, they can still absorb engine heat which raises the temperature of the air passing through the runners before it goes into the cylinder heads and combustion chamber.
The thermal barrier created by I-M Shield prevents that heat from affecting the intake manifold. The air passing through the runners stays cooler, meaning a denser air charge entering the cylinder heads, which in turn Heatshield says increases engine power.
I-M Shield is precut to fit the intake manifold, with only minor trimming required in some applications for a precise fit. Its adhesive backing can withstand up to 300° Fahrenheit of continuous heat, and it’s resistant to oils and solvents.
I-M Shield is available for all GM LS-series car intakes (LS1, LS2, LS3, LS6, LS7), 2011-2014 Ford 5.0L GT and Boss intakes, and Ford 2011-14 3.7L V-6 intakes.