K&N Replacement Air Filter (33-2442) Ford > Sierra > Cosworth if the valve is failing

if the valve is failing to dump it may be necessary to install a weaker spring

Designed to increase horsepower

The Splitter is a truly remarkable valve that gives a combination of blow off and recirculation valve operation

which makes a remarkable difference especially when changing gears at high RPM

Improve stance and wheel fitment of the Audi R8 with Perfco Performance Premium Wheel Spacers

K&N Replacement Air Filter (33-2442) Ford > Sierra > Cosworth if the valve is failingK&N washable, reusable High Flow Air Filters feature a state of the art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed to provide an increase in horsepower. Each performance air filter is reusable, engineered to last for the entire lifespan of your vehicle, and backed by K&N's No Hassle Lifetime Limited Warranty. K&N drop in replacement filters are designed to install easily into your