The Wacker Neuson is a genuine OEM Honda GX340/390 Muffler designed for the GP5600A and GP6600A series portable generators, including GPS5600A and GPS6600A variants across EPA, CSA, CARB, and CAN GFI configurations. Sourced directly from Wacker Neuson, this part carries the same specification as the component installed at the factory, ensuring a correct, verified fit across the full range of compatible GP-series machines. Whether your unit came with a wheel kit, electric start, or standard configuration, part number covers the Honda GX340/390 engine platform shared across these generator families. If your muffler is cracked, corroded, or producing excessive exhaust noise, this is the authorized replacement to restore proper operation.
Key Features
- Genuine OEM Exhaust Construction — Manufactured to Wacker Neuson's original material and wall-thickness specification for the Honda GX340/390 engine, so heat dissipation and back-pressure characteristics match the engine's designed operating range.
- Direct Bolt-On Replacement — Matches the original exhaust port flange pattern and mounting hardware configuration of the GX340/390 engine, so installation follows the standard service procedure without rework.
- Broad GP-Series Coverage — Confirmed fitment across GP5600A, GPS5600A, GP6600A, and GPS6600A generator variants in EPA, CSA, CARB GFI, and CAN GFI configurations, with and without wheel kits and electric start.
- Restores Proper Exhaust Flow — A damaged or leaking muffler disrupts exhaust scavenging on the GX340/390, which can cause rough running, elevated operating temperatures, and increased fuel consumption. Replacing it with 5000164865 returns the engine to its correct exhaust back-pressure balance.
- Emissions and Noise Compliance — The OEM muffler maintains the exhaust noise attenuation and emissions routing required by the certification standard (EPA, CARB, CSA, or CAN GFI) under which each specific generator model was approved. Using a non-specified substitute can affect regulatory compliance.
The muffler channels exhaust gases away from the engine cylinder, reduces combustion noise to an acceptable operating level, and helps manage the heat generated during engine operation. On Honda GX340/390-powered equipment like the Wacker Neuson GP5600A and GP6600A generators, the muffler is also part of the certified emissions control path — meaning its design directly affects how cleanly the engine burns fuel and how much noise it produces under load. When a muffler cracks, corrodes at the flange, or develops an internal baffle failure, operators typically notice a sharp increase in exhaust noise, the smell of raw exhaust gases near the operator position, and in some cases a drop in engine power due to disrupted exhaust flow.
Part Details
| Part Number | 5000164865 |
|---|---|
| Old Part Number | 0164865 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Honda GX340/390 Muffler |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Premium Portable Generator | GP5600A | 5000620094, 5000620095, 5000620381, 5000620382, 5000620326, 5000620327, 5000620984, 5000620979, 5000620980, 5000620042, 5000620043, 5000620091, 5000620092, 5000620011, 5000620012 |
| GPS5600A,CAN GFI | GPS5600A | 5000620096, 5000620383, 5000620328, 5000620981, 5000620982, 5000620044, 5000620093, 5000620013 |
| GP6600A GENERATOR,CAN GFI | GP6600A | 5000620100, 5000620101, 5000620384, 5000620329, 5000620330, 5000620045, 5000620046, 5000620097, 5000620098, 5000620014, 5000620015 |
| GPS6600A GENERATOR,CAN GFI | GPS6600A | 5000620102, 5000620386, 5000620331, 5000620047, 5000620099, 5000620016 |
| Premium Portable Generator | GP6600 | 5000620385, 5000620989, 5000620990, 5000620985, 5000620986 |
| GPS6600A Generator, EPA | GPS6600 | 5000620987, 5000620988 |
| GP5600A Generator, EPA w/Wheel Kit | GP5600 | 5000620983 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
Wacker Neuson