CNC Turbo Exhaust Manifold Flange Plans – 1.8L Ecotec

CNC Turbo Exhaust Manifold Flange Plans (STL + STEP Format) for the 1.8L Ecotec Engine

This CNC Turbo Exhaust Manifold Flange was built for real-world horsepower—and battle-tested on my own 525 WHP 1.8L Chevy Cruze. Whether you’re fabricating a full manifold from scratch or working with a CNC shop, this flange is the rock-solid foundation serious boost demands.

Unlike basic laser-cut flanges, this design is built for CNC machining and includes both STL and STEP files for clean port transitions, perfect bolt alignment, and proper sealing surface geometry. It’s engineered to support custom manifold builds using 10-gauge stainless steel pipe fittings or elbows.

Once downloaded, just send the file to your CNC machinist or drop it into your own CAM software. You’ll also get a video walkthrough showing how I positioned and welded my setup, plus info to my trust CNC vendor.

What’s Included:

✅ STL and STEP files for CNC machining
✅ Designed for 10-gauge stainless runners / elbow fittings
✅  Build plans and Step-by-step video walkthrough
✅ Trusted vendor recommendation for CNC cutting

Engine Compatibility:

• 1.8L Ecotec: F18D4, A18XER, 2H0

• 1.6L Turbo Ecotec: Z16LET, Z16LER, A16LET, A16LER

• Fits: Chevy Cruze, Sonic, Saturn Astra, Vauxhall Astra, Corsa, Insignia 1.6T

Forget blown gaskets and leaky flanges. This CNC flange was born on the bench and proven on the track. If you’re building a manifold for real power, this is your starting point. Built by a racer—for racers.

I’ve already battle-tested this part on the street and track. Now it’s your turn to bolt up something that actually works—no guesswork, no compromises.

Visit my YouTube channel to learn more about turning your 1.8 or 1.6L Ecotec engine into a high horsepower, road or track dominating monster!