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"We have finally superseded the half-decade old, single turbo ball bearing design with the new TK10-S. The entire TK10 family is modular, so parts are interchangeable! This uses the same highly engineered compressor housing and internals found on the full turbo “R” version. Also included is a Turbo Spec Card for authenticity."
<https://www.turbokeychains.com/product/tk10-s-turbo-keychain/?attribute_color=Gold&attribute_impeller-type=SHF>