The K&N 69-0025TP is a complete Typhoon cold-air intake for the 2.4-liter four-cylinder Acura TSX. It uses a mandrel-bent aluminum tube with a polished finish and swaps out the factory air filter and housing. The manufacturer says the filter installs in the original air box space, which lets the engine draw air through a smoother, less restrictive path. The same kit is also listed for some Honda Accord VIII models, so confirm your exact application before ordering.
Against stock, the manufacturer's estimate is a gain of about 4.18 horsepower at 5,300 RPM and roughly 4.1 lb-ft of torque. Treat these as estimates, since results depend on the rest of the car. The included K&N cotton-gauze filter is washable and reusable, its replacement is listed as RU-4870, and the kit carries a No-Hassle Lifetime Limited warranty. The CARB EO number D-269-37 supports emissions compliance in some states, but California legality details vary, so confirm with the manufacturer if you live under California emissions rules. Search terms: Acura TSX 2.4L polished cold air intake, K&N Typhoon 69-0025TP, TSX CCA intake 2004-2006, K&N CARB EO D-269-37.
The manufacturer's application lists the TSX L4 2.4L for 2004 through 2008, while the product name references 2004-06. Confirm your model year and engine size with the manufacturer before ordering.
The manufacturer lists RU-4870 as the replacement filter for this kit.
The manufacturer's guidance for Typhoon filters is cleaning about every 100,000 miles under normal highway driving. Confirm the interval for your driving conditions with the manufacturer.
The kit is listed with CARB EO number D-269-37, but details on California legality vary. Confirm with the manufacturer before buying if you are subject to California emissions rules.
Owners on user forums who have fitted Typhoon kits to Honda four-cylinders report installs of roughly 90 minutes with basic hand tools, reusing the factory mounting points. Disconnect the battery before starting, and note the orientation of the mass airflow sensor, since it must go back in the same way it came out. Reconnect the crankcase and EVAP vent hoses and check every clamp before you drive, as loose couplers are the most common source of unmetered air leaks. Expect fiddly work around the sensor connectors and heat shield.
