This a service we offer to add plenum volume to your carb style intake manifold. We CNC machine the flange off and enlarge the opening along with blending the runner entry to the new opening. We then fabricate an intake elbow to accommodate the throttle body of your choice. Pair this service with our EFI conversion for a proven race wining combination. Once the order is placed allow 24 hours for a worksheet to be emailed that must be completed and included with your intake when you are shipping it to us. Once the service is completed we will email an invoice with the return shipping costs.