12.5 in (318 mm). The 69-4527TS air intake comes with a chrome topped K&N high-flow air filter and a heat shield that installs into the previous air box space. K&n typhoon cold air intake system fits 2012-2014 cadillac cts 3.0l 3.6l v6 the restrictive factory air filter and air intake housing are replaced by the k&n typhoon air intake which is designed to dramatically reduce air flow restriction as it smoothes and straightens air flow.