Momentum Worx STREET SPOOL | Garrett GTX4709

Momentum Worx STREET SPOOL Turbo – Garrett GTX4709 for Caterpillar C15 & 3406E

If you’re building a Caterpillar C15 or 3406E and need more than a BorgWarner S410SX, but don’t want to deal with a lazy, oversized race turbo — this is the move.

The Momentum Worx STREET SPOOL GTX4709 is built for one thing: usable, streetable horsepower.

This is the perfect middle ground between a stock-style turbo and a full competition setup — delivering fast spool, strong midrange torque, and real top-end power without killing drivability.

Built on the Proven GT47 Platform — Fixed Where It Matters

The factory CAT 3406E / C15 GT47 turbo is known for one thing: durability.

The problem? The small 75mm compressor wheel chokes it out up top.

We kept what works — and replaced what doesn’t.

• Retains the legendary GT47 turbine platform
• Maintains stock-style exhaust flow characteristics
• Upgrades to a modern ball bearing Garrett GTX4709 CHRA
• Larger, more efficient GTX compressor wheel for increased airflow

Result: stock-like spool with significantly more power potential.

Built for Real C15 & 3406E Street Performance

Big displacement diesel engines don’t tolerate poor turbine design. Open housings kill response and make trucks miserable off-boost.

The STREET SPOOL avoids that completely.

By pairing a ball bearing GTX4709 with a tight 1.42 A/R T6 divided (twin scroll) wastegated housing, you get:

• Quick spool similar to stock GT47 setups
• Strong low RPM boost response under load
• Clean, predictable throttle control
• Reduced turbo lag compared to open T6 setups

This is how a C15 or 3406E turbo upgrade should behave.

Designed for Real-World Truck Fitment

No fabrication circus.

• Standard Marmon exhaust outlet – works with factory-style exhaust systems
• T6 divided flange – compatible with stock and performance manifolds
• V-band compressor outlet – simple, secure charge piping

This is a true bolt-on turbo upgrade for Caterpillar C15 and 3406E applications.

What’s Included

• Genuine Garrett GTX4709 Ball Bearing Supercore
• 1.42 A/R T6 Divided Wastegated Exhaust Housing
• V-Band Compressor Elbow, Clamp, & O-Ring

Turbo Specifications

• Turbine Wheel: 93mm / 84mm
• A/R Ratio: 1.42
• Compressor Wheel OD: 109mm
• Compressor Inducer Options: 76mm / 80mm

Estimated Power Range

• 76MM – 600–650 WHP
• 80MM – 650–700 WHP

Power will vary based on injectors, fueling system, tuning, and overall build — but this is the proven range for Caterpillar C15 and 3406E performance trucks.

Perfect For

• Caterpillar C15 turbo upgrades
• Caterpillar 3406E performance builds
• Trucks stepping up from S400 / S410SX turbos
• Drivers who want quick spool + usable power

Need Help Picking the Right Setup?

Send your full build — we’ll give you a straight answer.

Info@momentumworx.com

Bottom Line

If you want a GT47-based turbo upgrade for your Caterpillar C15 or 3406E that actually improves performance without ruining drivability — this is it.

More power than an S410SX.
Faster response than most T6 setups.

No fluff. Just a better turbo.