Kohler Muffler for CH11–CH15 Engines — 11" Length, 5" OD OEM Replacement for CH12.5 CH13 CH15

Replacement Kohler OEM muffler (part 12 068 58-S) designed to fit CH11–CH15 engines with a 5" outside diameter and an 11" overall length.

This is an original equipment replacement muffler manufactured to Kohler specifications for use on small engines including CH11, CH12.5, CH13 and CH15 models. It replaces Kohler part numbers 12 068 36-S, 12 068 46-S, 12 068 47-S and 12 068 58-S, offering the correct dimensions and inlet pipe size for a direct swap. Built to match factory fitment, the unit helps restore proper exhaust routing and keeps the engine operating within designed noise and backpressure parameters.

Will this muffler fit my Kohler CH-series engine?

Yes — this OEM muffler is engineered for Kohler CH-series engines. It’s specified to fit CH11 through CH15 models, so confirm your engine model before purchasing to ensure compatibility.

• Fits Kohler CH11, CH12.5, CH13 and CH15 engines.
• Replaces Kohler part numbers: 12 068 36-S, 12 068 46-S, 12 068 47-S, 12 068 58-S.
• Check engine model stamping or manual for CH-series match before ordering.

What are the muffler’s exact dimensions and inlet size?

The muffler measures 11 inches overall in length with a 5-inch outside diameter body and a 1 1/4-inch OD inlet pipe. These dimensions are critical for ensuring the muffler mounts correctly and aligns with the exhaust port and mounting brackets on the engine.

• Overall length: 11 inches.
• Body outside diameter (OD): 5 inches.
• Inlet pipe diameter: 1 1/4 inches OD.

Is this an original Kohler part or an aftermarket substitute?

This listing is for an OEM Kohler muffler made to the manufacturer’s specifications and sold under Kohler part number 12 068 58-S. Using an OEM replacement helps preserve factory fit, finish and performance characteristics compared with generic aftermarket units.

• OEM Kohler part — not a generic copy.
• Manufactured to Kohler tolerances for proper fitment.
• Direct replacement for the listed Kohler part numbers.

How do I install this muffler and what should I inspect?

Installation typically involves removing the old muffler’s mounting bolts and inlet connection, sliding the replacement into place, and tightening hardware to the engine’s torque specifications. Inspect gaskets, mounting studs and heat shields during installation and replace any worn components for a secure, leak-free fit.

• Remove old muffler and inspect mounting studs and gasket.
• Fit inlet pipe onto exhaust outlet, align mount holes, tighten hardware.
• Replace damaged gaskets or fasteners to prevent leaks and vibration.

Who this is for: This OEM Kohler muffler is suited for owners and technicians maintaining Kohler CH-series small engines who want a direct-fit factory replacement. It’s ideal for landscapers, equipment rental shops, maintenance crews and DIYers needing the correct dimensions and part numbers to restore exhaust fitment and engine operation without fabrication or modification.