S58 Cast Top-Mount Single Turbo Kit (G8X / X3M / X4M)

If you’ve been waiting on a real single turbo option for the S58 that’s built right, fits right, and doesn’t come with a crazy price tag — this is it.

This is our cast top-mount single turbo kit for BMW’s S58 platform. It’s designed for customers who want a clean, complete top-mount setup that can support up to 1200hp with the right turbo and supporting mods.

The goal with this kit was simple:

Make a single turbo conversion that’s strong, reliable, and aggressively priced — while still being made entirely in the USA.

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Fitment (RWD + xDrive)

This kit fits both RWD and xDrive S58 cars, including:

• G80 M3

• G81 M3 Touring

• G82 M4

• G83 M4

• G87 M2

• F97 X3M

• F98 X4M

If you’re unsure about your exact setup (especially downpipe/exhaust configuration), message us and we’ll confirm it with you before ordering.

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Cast Top-Mount Manifold (USA Made)

The heart of the kit is the cast top-mount manifold.

We went cast for a reason — it holds up better long term, handles heat cycling well, and it’s a solid choice for anyone who actually plans on driving the car hard instead of just chasing dyno numbers.

Top-mount placement also keeps everything accessible, makes the setup easier to work on, and keeps the overall layout clean.

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Twin Turbosmart 45mm Wastegates

Boost control is one of the biggest issues with high-power setups if you cheap out or go undersized.

This kit uses dual Turbosmart 45mm wastegates, which gives you the control needed to keep boost stable and consistent at higher power levels.

Whether you’re on lower boost for a safe street setup or turning it up on ethanol, you’re not fighting unstable boost behavior.

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Built for Up To 1200HP Capability

This kit is designed to support up to 1200hp potential depending on your turbo selection, fueling, and overall setup.

To be clear: the kit isn’t the limiting factor here — your turbo choice, fuel system, and tuning are what will decide the final number.

This is the right foundation if your goal is:

• 900whp street setup that’s reliable

• 1000–1100whp build that hooks

• Full 1200hp capable setup with the right supporting mods

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Catch Can Bracket Comes Standard (Catch Can Optional)

This kit includes a catch can / coolant relocation bracket as standard, so your engine bay stays clean and everything mounts correctly.

Catch can kit is optional, meaning you can choose to add it depending on your build and goals. We recommend it for higher power setups and customers that want the cleanest long-term oil control possible, but it is not required to run the kit.

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What’s Included

This kit is built to cover the parts people always end up piecing together later. No guessing, no random missing hardware.

Included:

• Cast top-mount turbo manifold (S58)

• (2) Turbosmart 45mm wastegates

• Downpipe components (with gaskets)

• Manifold gasket

• Dump tube

• Oil feed line + fittings

• Oil drain hose + drain flange + hardware

• Coolant hose + relocation parts

• Coolant extension harness

• Turbo blanket

• 3” silicone couplers

• Catch can / coolant relocation bracket (standard)

Optional add-on:

• Catch can kit

Turbo is configurable depending on your build and power goal.

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Why This Kit?

There are a lot of S58 turbo kits out there — the difference is most of them are either:

1. insanely overpriced for what you get
   or

2. “cheap” but missing key parts, questionable quality, or inconsistent fitment

This kit is built for the customer that wants a proper single turbo setup at the best price possible.

✅ Made entirely in America
✅ Cast top-mount design
✅ Twin 45mm Turbosmart wastegates
✅ Fits RWD + xDrive
✅ Designed around 1200hp capable builds
✅ One of the most aggressively priced kits on the market

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Important Notes

• Professional installation recommended

• Tuning required

• Supporting mods required for higher power goals (fuel system, intercooler, etc.)

• Exhaust components are off-road use only where applicable