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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 …

"Honestly since putting your compunds on my truck has performed way better than before.. I can drive with out the overdrive off or in tow haule.. it just spools and pulls hard .. tons of power .. gets cooled from 1700* to 1300* on big time .. shreds tires down the freeway at 50.. the big test will be towing.. but I’m excited instead of worried!!" Chris Weaver