The K&N 63-9036 is a 63 Series AirCharger cold air intake built for the 5.7L V8 in the Toyota Tundra. The manufacturer describes a tube made from high-density polyethylene and a red, oiled cotton filter, and the kit is meant to take the place of the factory filter and intake tube rather than sit alongside them. Because the stock intake is replaced, the buyer gets a dedicated cold-air path instead of a drop-in filter that keeps the factory airbox.
The manufacturer's estimate is roughly 9.25 horsepower at 5,497 RPM over the factory setup. Owners on user forums are divided on how noticeable that gain is, and several argue that a cold-air intake pays off more when paired with an exhaust upgrade. The stronger practical case is the filter: the manufacturer says it needs cleaning only about every 100,000 miles under normal highway driving, so a washable, reusable element can offset the recurring cost of disposable filters. Choose this over a cheaper drop-in filter if you want a full intake with a long service interval and a fitment-specific design for your truck.
Fitment is listed by the manufacturer as 2012–2021 Toyota Tundra with the 5.7L V8 (F/I). Shoppers searching for a 2012-2021 Tundra 5.7L cold air intake, a 63-9036 install, or a no-tune Tundra intake will find the key details here. Installation is typically about an hour with basic hand tools, and the install sheet walks through disconnecting the battery, the mass airflow sensor, and the airbox assembly.
Owners on user forums report that K&N told them no tune is needed after installation. Confirm with the manufacturer if you plan to run a custom calibration.
The manufacturer recommends that customers do not discard the factory air intake, so store the removed parts in case you need to return the truck to stock.
Owners on user forums report check engine lights after installing an oiled K&N filter and point to excess oil reaching the mass airflow sensor. Keep the filter lightly oiled, and reset the computer by disconnecting the battery if a light appears.
The manufacturer states the filter requires cleaning about every 100,000 miles under normal highway driving conditions.
The manufacturer's install sheet indicates the job takes about an hour with simple hand tools, including a 9/16 wrench, 3mm and 4mm Allen wrenches, a 10mm socket and wrench, an extension, a ratchet, and flat and Phillips screwdrivers. Disconnect the negative battery cable first, but note that this erases stored memory settings, and some radios will require an anti-theft code. Then disconnect the mass air sensor connector and harness, remove the engine cover, and release the airbox clips before installing the heat shield bracket. The kit is not designed for vehicles with a body lift. The manufacturer warns that skipping the instructions or using improper hardware can damage the intake tube, throttle body, or engine, so use only the supplied hardware.
