Momentum Worx STREET SPOOL | Garrett GTX5533

Momentum Worx STREET SPOOL Turbo – Garrett GTX5533 for Caterpillar C15 & 3406E

If you’re building a high horsepower Caterpillar C15, 3406E. Or Detroit Series 60, this is the turbo that bridges the gap between race truck power and real-world drivability.

The Momentum Worx STREET SPOOL is built around the proven Garrett GTX5533, but fixed where most setups fall short — drivability.

Traditional GTX55 setups on big bore diesel engines (like the CAT C15, 3406E, Cummins ISX, and Detroit Series 60) tend to suffer from lazy spool and poor low RPM response due to open turbine housings. That’s fine on a dyno. It’s a problem on the street.

We solved that.

Built for C15 & 3406E Performance Trucks

The STREET SPOOL pairs a ball bearing Garrett GTX5533 CHRA with a T6 divided (twin scroll) wastegated exhaust housing, giving you:

• Faster spool-up on large displacement diesel engines
• Stronger low RPM boost response
• Better throttle control under load
• Reduced turbo lag compared to open housing GTX55 setups

This is exactly what a Caterpillar 3406E or C15 needs to stay responsive while pushing serious horsepower.

Real-World Fitment for Working Trucks

No weird fabrication headaches here.

• Standard Marmon exhaust outlet – works with common heavy-duty exhaust systems
• T6 divided flange – perfect for performance manifolds
• V-band compressor outlet – clean, secure charge piping connection
• *Cats will need to use the included V-band elbow

This turbo is designed to bolt into real trucks, not just sit on a show build.

Included:

• Genuine Garrett GTX5533 Ball Bearing Supercore
• 1.18 A/R T6 Divided Wastegated Exhaust Housing
• V-Band Compressor Elbow, Clamp, & O-Ring

Turbo Specs:

• Turbine Wheel: 112mm / 102mm
• A/R Ratio: 1.18
• Compressor Wheel OD: 133mm
• Compressor Inducer Options: 85mm / 88mm / 91mm

Power Ratings (Estimated):

• 85MM – 750–800 WHP
• 88MM – 950–1000 WHP
• 91MM – 1100–1200 WHP

These are real-world estimates for Caterpillar C15 and 3406E performance builds. Final results depend on injectors, tuning, fueling setup, and overall combination.

Who This Turbo Is For

• High horsepower C15 / 3406E street trucks
• Performance builds that still need drivability
• Owners tired of laggy, open housing GTX55 setups
• Anyone who wants big power without sacrificing response

Need Help Choosing?

If you’re unsure which size is right for your setup, send us your full build.

We’ll give you a straight answer — no guessing.

Info@momentumworx.com

Bottom Line

If you want a GTX5533 turbo that actually works on a Caterpillar C15 or 3406E, not just one that looks good on paper — this is it.

Big power. Fast spool. No nonsense.