Answers: The K&N intake and headers/exhaust system will allow the engine to pump more air through the cylinders and potentially allow the engine to kind more power, but it will also burn more fuel, so in most cases, your MPG will progress down.
Once you have adjectives this work done, take it to a professional and hold the fuel injection recalibrated. If you don't you could end up beside the engine running too lean, and that could damage your engine.
5 extra hp
It will a short time ago make your exhaust gas flow out much faster. Also the weight of the headers are much lighter than the stock.
Your exhaust will be more free flowing, which will impart you a small gain in power. You will receive the most power from equal length headers. You might own a heat issue, if you do, a moment ago buy some header wrap and wrap the headers.
You will also notice your vehicle sounds cooler. Headers sound awesome, they manufacture a very appreciable tone to the exhaust. It's very uncomplicated to tell newly from the sound when a vehicle is running headers and when it isn't.
Correction:
Header (singular)
Your car is a 4 banger
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