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Manifolds Built for Heavy CAT Diesels

The big CAT diesels live under extreme heat, pressure, and constant vibration, and the OE manifolds fatigue and crack — warping, center-divider failure, and exhaust leaks. These high-flow stainless (and HSMD) manifolds use stronger material, larger ports, and a leak-resistant design that resists the cracking that kills the factory casting, while improving flow.

Fits these engines

  • Caterpillar 3406E / C15 / C16 — high-flow stainless exhaust manifolds
  • 2004.5–2010 CAT (ACERT-era) — stainless high-flow manifold

Frequently Asked Questions

Why do CAT C15 and 3406E manifolds crack?
Extreme heat, exhaust pressure, and constant vibration in heavy on-highway use fatigue the OE casting — you get warping, center-divider failure, and exhaust leaks.
What's better about a high-flow stainless manifold?
Stronger stainless or HSMD construction with larger ports and a leak-resistant design resists the cracking and warping that kills OE manifolds — and it flows better.
What engines does this fit?
CAT 3406E, C15, and C16 (including ACERT-era). Match your engine on the product page.
Is this for trucks?
These are the heavy CAT diesels common in on-highway trucks and swaps. Get the right part the first time.