As far as my first engine modification on my 08 Si is concerned, this is a great start. Don't expect to feel the advertised HP boost (7 HP). True horsepower boost or not, this is a much more breathable and premium intake system than the stock airbox. It is also a great starting point for further modifications to the engine, header, exhaust, honda, brackets etc. In my opinion the best no chill air intake for an 8th gen Civic Si. Sounds amazing too.
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