Here is an inside look at the operation of compound turbos.Compound turbos, also known as sequential systems, utilize a small turbo that spools up quickly and supplies the engine with air until a larger turbo has the time to spool up and engage. This process provides substantial amounts of air while simultaneously alleviating turbo lag. So, here's how it works. The air filter allows air to enter either the S400 turbo, which is significantly larger than the S300 or small turbo.We typically use a
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