Stainless Turbo Manifold for Mazda MX-5 Miata (1990-1993) 1.6L

High-Flow T2 Stainless Steel Turbo Manifold for 1990-1993 Mazda MX-5 Miata (NA)

What it Does: The Stainless Steel Turbo Manifold replaces the naturally aspirated OEM exhaust assembly on the 1990-1993 Mazda MX-5 Miata to route exhaust gas pulses directly to a T2-flanged turbocharger, enabling forced-induction conversions with reduced backpressure.

The Stock Mazda MX-5 Miata Exhaust Manifold Bottleneck

The factory cast-iron exhaust manifold on the naturally aspirated NA Miata is designed strictly for low-output atmospheric breathing. Its restrictive runner profiles, rough internal casting, and lack of a turbocharger mounting flange make forced induction impossible without custom fabrication. In addition, stock cast assemblies are prone to thermal fatigue, excess weight, and high exhaust reversion when backpressure builds under aggressive driving cycles.

The Engineering Solution

Constructed with mandrel-bent stainless steel primaries, this tubular turbo manifold optimizes exhaust gas momentum directly into the turbine housing. Smooth internal transitions preserve kinetic pulse energy to accelerate turbine spool on the B6ZE 1.6L powerplant. Precision TIG welds resist thermal cycling, elevated exhaust gas temperatures (EGTs), and structural stress under boost, while the standard T2 footprint accommodates compact T25 and T28 turbochargers for linear, responsive torque delivery.

What's Included

• 1x Stainless Steel Turbo Manifold (T2 / T25 / T28 Flange)
• 1x Exhaust Manifold Cylinder Head Gasket

Technical Specifications

Compatibility

• 1990-1993 Mazda MX-5 Miata Base Convertible 2-Door (1.6L L4 Gas)
• 1991 Mazda MX-5 Miata Special Edition Convertible 2-Door (1.6L L4 Gas)
• 1993 Mazda MX-5 Miata LE Convertible 2-Door (1.6L L4 Gas)

Frequently Asked Questions & Fitment Warnings

Does this fit the NA MX-5 Miata?

Yes, this is a direct fit for the 1990-1993 Mazda MX-5 Miata equipped with the B6ZE 1.6L engine. It does not fit 1.8L (BP) engines or 1994+ Miata chassis due to differing exhaust port spacing.

Is an ECU tune required after installing this manifold and a turbocharger?

Yes, any forced-induction conversion requires custom fuel mapping and ignition timing calibration to prevent catastrophic engine detonation.

The Mazda Performance Standard

Delivering true JDM sports car capability requires balancing lightweight responsiveness with thermal durability, ensuring your boosted roadster pulls cleanly through redline without manifold cracking or flow restriction.