Tial BOV Spring (Genuine Tial parts)Sold individually / Priced Per Unit  Tial BOV Spring for 50mm/Tial Q/Tial QR/QRJTIAL (PN: Q.SPRING.2) Q BOV SPRING; 2 PSI; FOR SUPERCHARGER APPLICATIONS) (Item Sold Per PC)2 psi (green) for Supercharger only DescriptionTial BOV Spring. Made by Tial and used to change out the spring pressure on the Tial 50mm BOV to affect the BOV response tuning to reduce compressor surge (different spring levels affect amount of vacuum required on each engine to open the BOV on throttle release)
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