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Call it a pre-wastegate. It restricts flow to the wastegate until an adjustable threshold manifold pressure is reached, which means that your car will build more boost.
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Silver 1998 Volvo S70 T5 <- Daily (Anja)
Guards Red 1986 951 <- Seattle car (Gretchen)
White 1976 914 2.0 F.I. <- Prodigal car, traded away then brought back again (Lorelei)
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