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Compression ratio is the ratio that the pistons move at, for example 9.5:1, 11:1. I really dont know how to explain it but for an all motor you would need high compression, like 11:1, or 13:1. For turbo you would need low compression, 8:1, 9:1. Headers connect to the engine head and it gets rid or hot air which would come out of the exhaust. also gives you horsepower boost depending on size of it.
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