This is a Skunk2 factory replacement 3.5L Plenum part for the Ultra Race Side-Feed B & D Series Intake Manifolds; 307-05-9000, 307-05-9200, 307-05-9050.

• Skunk2 Factory Replacement For PN[307-05-9000/9050/9200]
• Optional Plenum Spacers Available in 1L Or 2L Sizes
• 90mm Throttle Body Flange - Std. 5.0L Ford Pattern
• Removable Plenum In Silver
• US Patent No. D673977
• 3.5L Plenum Volume