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aFe Silver Bullet throttle body spacer for Nissan Patrol (Y61) 4.8L applications is a billet 6061-T6 aluminum spacer that creates controlled airflow turbulence at the throttle inlet. The serrated/helix entry design aims to increase air speed, reduce whistle noise common to some spacers, and improve throttle response and fuel efficiency according to the product description. This spacer is CNC-machined for fit and finish in compatible manifolds.
aFe Silver Bullet Throttle Body Spacer TBS 17-19 Nissan Patrol (Y61) I6-4.8L
