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ALTA boost recirculation valve spring upgrade fits 2007–2012 Mini Cooper S and JCW models, including Convertible and Clubman S/JCW variants noted in the source. The spring upgrade is intended to alter bypass valve characteristics for that turbocharged application, offering a component-level enhancement that is specific to the listed Mini Cooper S and John Cooper Works models.
ALTA 07-12 Mini Cooper S/JCW & 09-12 Convertible / 09-12 Clubman S/JCW BPV Spring Upgrade
