European Cars
Air Filters and Intake Manifolds
Late Model 1979-New Ford Mustangs
Vauxhall Astra

How can you know the horsepower gained with a KN air filter fitted on Astra coupe 1.8 16v which has 125 horse power?

Answer

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Wiki User
11/21/2007

http://www.regal-auto.co.uk/

The 1.8 ecotec engine has its intake and exhaust system greatly restricted. De-restricting this will naturally make the car feel more responsive, however just fitting a K&N air filter may only get you an increase of 5BHP.