13B Top Mount Manifold

Fitment Photos: BorgWarner EFR8474

Note: This listing is for the Manifold and Wastegate Provisions only.

Built on a 13B engine using FD RX-7 engine mounts, this manifold is not chassis-specific and may require adjustment depending on your setup.

Function Fabrication’s Top Mount Turbo Manifold is a slightly lower-profile option for those who want the same high-quality build as our High Rise manifold, but with improved clearance and less mechanical stress.

This version sits approximately 2.5" lower than our High Rise, helping to keep heat and proximity away from the intake manifold while reducing leverage and long-term stress on the manifold assembly itself. It’s ideal for tighter engine bays or setups where manifold height is a concern.

Made entirely from 2" schedule pipe construction, each manifold is handcrafted in the USA using 100% American-sourced materials, machining, and welding.

We use a premium T4 divided collector from Shearer Fabrications and a billet 13B exhaust flange from JM Fabrications. Nearly 25% of the total manifold cost is in the flanges alone — no shortcuts here.

This version is built for Turbosmart 40mm wastegates by default, but we can tailor it to your preferred configuration upon request (1–3 week lead time for custom setups).

✅ Confirmed Fitment: BorgWarner S364.5SX-E
✅ Fits Most T4 Frame Turbos
📦 Current Lead Time: 2 Weeks to Ship

Special Offer:
Purchase this manifold and bring your build to us for custom wastegate dump tubes or downpipe fabrication and receive 25% off labor. We know how hard it is to find someone capable of doing the job right — we're here to help.