Turbo Manifold Mazda Miata VVT MX5 - BP4W
Mazda MX-5 BP4W VVT Turbo Manifold
Developed for turbocharged Mazda MX-5s using the BP4W VVT engine, the Walton Motorsport BP4W Turbo Manifold provides a modern V-Band turbo platform for responsive street, track and competition builds.
The lightweight MX-5 chassis responds particularly well to turbocharging, and this manifold allows the BP4W to be paired with a modern turbocharger while retaining a compact installation suited to the packaging constraints of the MX-5 engine bay.
Mazda BP Turbo Manifold - Designed for the BP4W VVT Engine
This manifold is designed specifically around the Mazda BP4W engine, providing the correct cylinder-head fitment and turbo positioning for VVT-equipped MX-5 applications.
For a lightweight car like the MX-5, the objective doesn't necessarily need to be an enormous peak-power figure. Turbocharger selection can instead be biased toward response, transient performance and a broad usable powerband, creating a car that makes effective use of the additional performance on both road and track.
Mazda BP Turbo Manifold - Modern V-Band Turbo Options
The manifold is available with a Garrett V-Band turbo inlet suitable for G25, G30 and G35 turbochargers, along with compatible Turbosmart Frame B and HPT Frame 2 options.
This provides scope to tailor the turbo system around the engine specification and intended use, from a smaller response-focused combination through to more extensively developed BP4W builds requiring greater airflow.
Mazda BP Turbo Manifold - Wastegate & Boost Control
The manifold features a 40–50 mm external wastegate port, allowing the wastegate configuration to be matched to the turbocharger, boost level and engine combination.
The wastegate port is supplied without a flange fitted, providing flexibility when specifying the final boost-control package.
Mazda BP Turbo Manifold - Power Steering Compatibility
The manifold can be used on power-steering-equipped MX-5s, although minor reworking of the hydraulic lines is required to provide the necessary clearance.
This should be considered when planning the installation, particularly on a street-driven MX-5 where retaining the factory power-steering system is desirable.
Building Your Mazda BP4W Turbo System
The manifold forms the foundation of a custom BP4W turbo system, with the turbocharger, wastegate, downpipe, intake, charge piping and supporting oil and coolant systems specified around the individual vehicle and intended use.
If you're unsure which turbocharger or wastegate configuration best suits your BP4W MX-5, contact Walton Motorsport before ordering and we can help establish the appropriate specification.
Further Questions?
Turbo Manifold Mazda Miata VVT MX5 - BP4W - Garrett V-Band (G25/G30/G35) / Turbosmart V-Band (Frame B Turbos) / HPT Frame 2 / 40 - 50mm Port Size (NO flange fitted) is backordered and will ship as soon as it is back in stock.
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Turbo Manifold Mazda Miata VVT MX5 - BP4W
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Suits ChassisMazda NA, Mazda NB, Mazda NC
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Built to Last. Backed for Life.
A lifetime warranty is easy to offer. Building a turbo manifold that's unlikely to ever need it is the hard part.
You can find the full details of the Walton Motorsport Warranty HERE
Every Walton Motorsport manifold is engineered to withstand the extreme temperatures, vibration and abuse that come with high-performance street and race applications. From material selection and fabrication to our cast collectors and proven designs, durability is built into every product.
The biggest inconvenience of a failed manifold isn't the repair—it's the downtime, the labour to remove it, and the event or track day you might miss. That's why our focus has always been on preventing failures before they happen, not simply replacing parts after they do.
We're proud to stand behind every manifold we manufacture with a Lifetime Warranty. While no mechanical component is indestructible, our goal has always been simple: build products that earn your trust by performing reliably for years to come.
Because when you choose Walton Motorsport, the last thing you should be worrying about is your manifold.
Material Selection
Every Walton Motorsport manifold starts with carefully selected 304 stainless steel tubing. Not all 304 stainless is manufactured to the same standard, and the quality of the tubing plays a critical role in the durability of the finished product.
Turbo manifolds are subjected to thousands of extreme heat cycles throughout their life. Lower-quality tubing can fatigue over time, and we've seen inferior materials crack or split along the welded seam under these conditions. That's why we specify the exact tube grade and wall characteristics we know will perform reliably in demanding street and motorsport applications.
Our cylinder head flanges are designed in-house and precision cut using modern fibre laser technology, providing exceptional dimensional accuracy and repeatability. Compared to traditional CO₂ laser cutting, fibre laser cutting delivers cleaner edges and tighter tolerances, ensuring an accurate fit and consistent sealing.
Manufacturing Process
Port-Matched Flange Construction
Rather than simply welding the runners to the face of the flange, Walton Motorsport machines each runner to pass through the flange before it is TIG welded from both sides. The ports are then hand-finished to produce a smooth, uninterrupted transition from the cylinder head into the runner.
This manufacturing method delivers several important advantages:
- Increased weld strength and long-term durability.
- Improved gas flow by eliminating abrupt transitions.
- A smoother change from the oval exhaust port to the round runner.
- Reduced turbulence for improved exhaust efficiency.
The result is a manifold that is stronger, flows better, and is built to withstand years of hard use.
Cast Merge Collector
At the heart of every Walton Motorsport manifold is our proprietary cast merge collector, designed entirely in-house.
Our latest collector design delivers the highest wastegate flow we've achieved while maintaining excellent merge efficiency into the turbine. The internal geometry provides smooth gas transitions, minimising turbulence and helping to reduce exhaust gas temperatures without sacrificing performance.
Unlike fabricated collectors assembled from multiple sections, our one-piece cast design eliminates internal joints and welds within the collector itself. This not only optimises gas flow but also significantly improves structural integrity, reducing the likelihood of collector failures that can damage turbochargers or engines.
Every design decision is made with the same objective: maximum performance, exceptional durability, and complete confidence when pushing your engine to its limits.
For a deeper look at our engineering philosophy and manufacturing methods, visit our Technical Centre.
Proven Motorsport Experience
In every Walton Manifold
