The Rampage Fabrication & Design Plenum Floor is machined from 6061-t6 Aluminum and available in 2 different port sizes for use on a variety of inline-6 motors. 


Now you can fabricate a custom manifold extremely easily by using round tubing for the runners of the manifold. Placement, runner length, and configuration are endless with the versatility and ease of building with round tube!


The outer edge of the flange is also machined to receive 3.5 x .125" tube and Mandrel bends.


Dimensions: 21.5" long / 3.625" port spacing / 3.5" tall


Price includes shipping within the mainland USA.   If you need shipping outside the USA, please contact us at for a shipping quote.


Please note: cancelled orders after payment will be charged a restocking fee.  See Return Policy.

RAMPAGE Intake Manifold Plenum Floor

Port Diameter
  • Our refund policy states that if an order is cancelled after payment was made that the buyer will pay up to a 20% restocking fee even if Rampage Fab has not shipped your product.  Rampage Fab may assess a larger fee if purchase of material was made to build your product.Buyer is responsible for return shipping.  


    We guarantee our products 100%.  If you are not completely satisfied, please contact us at to discuss.