STILLEN is a premier manufacturer of high-performance automotive aftermarket parts, specializing in exhaust systems, cold air intakes, superchargers, and body styling components.
Founded by racing legend Steve Millen in 1986, STILLEN (Steve Millen Sportparts, Inc.) is a dominant force in the automotive performance industry. Based in Costa Mesa, California, the company designs, tests, and manufactures high-quality upgrades for a wide variety of vehicles, including Nissan, Infiniti, Toyota, and American muscle cars. STILLEN is renowned for its commitment to performance functionality and durability, offering products that are race-proven and street-legal.
The brand's extensive catalog includes TruPower cold air intakes, cat-back exhaust systems, forced induction superchargers, and AP Racing Radi-Cal brake kits. In addition to power upgrades, STILLEN produces polyurethane body kits, spoilers, and aesthetic accessories designed to enhance vehicle aerodynamics and style. With a focus on precision engineering and OEM-quality fitment, STILLEN provides enthusiasts with reliable solutions to elevate their driving experience.
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Installation typically involves disconnecting the battery, removing the stock intake tube and airbox, transferring the Mass Air Flow (MAF) sensor to the new tube, and securing the STILLEN airbox and filter. Always follow the specific guide for your vehicle model.
This commonly occurs if the MAF sensor was disconnected while the battery was still connected, or if the sensor is installed backwards. Ensure the battery is disconnected during installation and double-check all sensor connections.
STILLEN urethane components come unpainted. They must be thoroughly scrubbed with scouring powder (like Comet or Ajax) and a Scotch-Brite pad to remove mold release agents. Use an elastomeric or acrylic primer designed for flexible parts before applying the final color.
Most STILLEN exhaust systems are designed as bolt-on kits that do not require welding. They typically use flanges and clamps for installation, making them accessible for DIY enthusiasts with standard tools.