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Perfect Fit Aftermarket CAT Mufflers

An excavator’s roar shows its power — but when the noise becomes excessive, or your machine loses power or leaks exhaust, productivity and safety are at risk.

When to Replace Your CAT Muffler

A damaged muffler doesn’t just sound bad — it harms engine efficiency and operator safety. Watch for these signs that your muffler needs replacement:

Loud or Irregular Noise: Internal baffles may have failed, or leaks opened up.
Power or Fuel Loss: Incorrect backpressure disrupts combustion efficiency.
Visible Rust, Cracks, or Holes: Structural failure lets exhaust escape.
Black Soot Around Seams: Sign of exhaust leakage at joints or welds.

If you notice any of these symptoms, replacing the muffler restores performance, protects the engine, and ensures compliance with job‑site noise limits.

CAT Mufflers by Machine & Engine Series

Our inventory covers a full range of Caterpillar excavators — from compact utility machines to heavy-duty 300‑Series workhorses. Find direct‑fit mufflers designed for each category below.

Mufflers for CAT 300‑Series Excavators (320, 330, 345, etc.)

Durable replacements for flagship excavators such as 320D, 325D, 330C, 336D, 345C, and 349D, supporting engines like 3066, C7, C9, C13.Each muffler is tuned for quiet efficiency and proper backpressure under constant heavy load.

Mufflers for CAT E‑Series & Legacy Models (E120B, E200B, E325, etc.)

Keep your trusted older equipment running smoothly. We offer mufflers for

E70B, E120B, E200B, E325B, compatible with engines like 3116, 3306, S4K‑T, S6KT — proven solutions for classic machines still in daily operation.

Mufflers for Compact & Utility Excavators (307, 312, 314, etc.)

Maintain quiet, efficient performance for smaller‑frame units. Compatible with

307C, 311C, 312D, 314D and engines such as 4M40, 3064, C4.2.

Product Compatibility Quick‑Reference

Muffler Application	Common Machine Models	Compatible Engines	Example Part Numbers
Mid‑Size Excavators	320C, 320D, 324D, 325D, 329D	3066, C7	324‑4172  /  222‑8299
Large Excavators	330C, 330D, 336D, 345C, 349D	C9, C13	239‑6488  /  239‑6580  /  266‑6213
Compact / Utility	307, 311C, 312D, 314D	4M40, 3064, C4.2	190‑5781  /  212‑8491  /  310‑9547
Legacy (Older Models)	E120B, E200B, E325B, 322B, 330B	S4K‑T, S6KT, 3116, 3306	085‑8373  /  1R‑7158  /  7Y‑1508  /  109‑9463

Shop with Confidence

We stock thousands of genuine‑fit Caterpillar aftermarket mufflers, each tested for:

Precise fitment across CAT 300‑Series & E‑Series machines
Material integrity — heavy‑gauge steel, rust‑resistant finish
Weld accuracy & backpressure compliance
Efficient packaging & rapid global delivery

Supported Models

CAT 300 Series: 312, 320, 325, 330, 336, 345, 349 ,

and more CAT E‑Series: E70, E120, E200, E307, E320, E325 ,

and more Engines: C7, C9, C13, 3066, 3116, 3306, S6KT, 4M40, and beyond

Upgrade your machine with a heavy‑duty aftermarket CAT muffler that keeps noise low, performance steady, and compliance effortless.

At a Glance

Direct‑fit OEM replacements for Caterpillar excavators
Engineered backpressure balance boosts horsepower & longevity
Durable anti‑corrosion construction for extreme conditions
Fast shipping worldwide — minimize downtime, maximize uptime