Scrambler Muffler | Honda CL350 / CL360 / CL450
Rusted-through mufflers are the normal condition of a Honda CL scrambler that has sat for fifty years, and nobody reproduces the factory system. These are universal shorty slip-ons sourced as a clean replacement. They are not exact reproductions of the original scrambler mufflers, but they look appropriate on the bike, and they restore the back pressure an open header throws away.
Why You Need This
Factory CL mufflers rust from the inside out. By the time the outside looks bad the baffling is usually gone, and a usable original pair is close to unfindable at any price. Open headers are the common stopgap, and they cost you low-end performance along with your hearing.
These are a far cheaper route than a full aftermarket scrambler system. They are small enough to suit the high-mount CL exhaust, which also makes them a low-profile option on a CB.
Specifications
| Spec | Detail |
|---|
| Fits Models | Honda CL350 K0–K5 (1968–1973), CL360 K0–K1 (1974–1975), CL450 K0–K6 (1967–1974) |
| Overall Length | Approximately 16.5 in. |
| Sold As | Sold in pairs (2 mufflers) |
| Mounting | Slip-on over the stock header. A custom bracket is required on every bike. |
| Muffler Clamps | Stainless steel T-bolt clamp, 47–51 mm. Sold separately. |
Note: Sold in pairs — one pair fits one motorcycle.
Note: Does not qualify for free shipping.
Note: These are universal mufflers. Each one ships with a generic mounting bracket, but the bracket has to be modified to suit your bike. Gaskets and T-bolt clamps are sold separately and are listed as options above.
Model-Specific Notes
- CL350 K0–K5 / CL360 K0–K1: Use the graphite pipe-to-muffler gasket (#5006) at the muffler joint, and the copper head-to-pipe gasket (#5004) at the cylinder head.
- CL450 K0–K6: Same graphite gasket (#5006) at the muffler joint, but a different copper gasket at the head — the CL450 uses the larger #5007, not the #5004 that fits the 350 and 360. The exhaust port diameter is not the same.
- CL350 K0: The K0 headers run straight further back on the bike than the later 350s and 360s, which changes where you can cut and where the muffler ends up sitting.
- CB350 / CB360: The inlet is the correct size for these header pipes, so the mufflers will work as a low-profile option. Mounting is still custom. If you want a period-correct set built for the bike, see our CB350 mufflers and CB360 mufflers.
- CJ360 / CB450 / CB500T: These bikes use a larger header pipe. The mufflers will slide over the header, but there is not enough clearance left for a full-size graphite gasket. For those bikes use our CB450 / CB500T mufflers instead.
Installation
Difficulty: Advanced
Tools needed: Hacksaw with a multi-purpose blade, power drill or drill press, drill bits, file, metric hand tools
Expect to fabricate. This is not a bolt-on. Most factory CL exhaust systems are welded together, so at least one muffler has to be cut off its header pipe, and how far back you can cut depends on your sub-model. Where you cut then determines where the muffler mounts and how the brackets have to be shaped. No two bikes come out the same.
- Cut the old muffler away from the header pipe and clean up the remaining pipe so the new muffler can slide on.
- Replace the copper gasket at the cylinder head while the system is apart. Old ones are usually crushed flat.
- Fit a fresh graphite gasket at the muffler joint. Graphite gaskets take a set the first time they are compressed, so they are one-time use.
- Slide the muffler onto the header and position the T-bolt clamp over the inlet.
- Modify the included bracket to suit your bike. On a CL350 K4 that meant mounting the top bracket at the rearmost end of the slot on the upper muffler, then drilling it for the lower bracket, notching it to clear the shock, and drilling again to pick up the M10 shock stud.
- Bolt the lower mount near the center of the lower muffler slot and run it up parallel to the shock, joining it to the upper bracket with an M8 bolt, lock washer, and nut.
- Depending on shock diameter you may need to trim the lower bracket to keep it from interfering.
- Mock the whole system up loose and align it before you tighten anything.
- Tighten the header, bracket, and clamp hardware evenly.
- Do a final clearance check before riding.
Anti-seize the T-bolt clamp threads and the bolt seat. Exhaust hardware seizes, and you will thank yourself the next time this comes apart. If you separate the muffler from the header later, plan on a new graphite gasket — the old one will not seal twice.
The whole job on that CL350 K4 took about an hour. We do not have a CL-specific install video, but the bracket work and the gasket technique are the same on our CB350 muffler installation guide, which is worth reading before you start cutting.
Frequently Asked Questions
How loud are these?
Loud. They are a shorty muffler, and they will be louder than the stock scrambler system. If that is more than you want, the usual fix is to add baffling — our preferred method is pushing one or two coarse stainless steel scrubbing pads into the front of the muffler. It knocks the edge off without changing the look.
How long are they?
About 16.5 in. end to end.
Which gaskets do I need?
Two different ones, and the copper gasket is not the same across the CL range. Every CL uses the #5006 graphite gasket at the muffler joint. At the cylinder head, the CL350 and CL360 use the #5004 copper gasket and the CL450 uses the larger #5007. Check the options above — both are listed there.
Do the clamps come with them?
No. The stainless T-bolt clamps are sold separately and are listed as an option above. You want the 47–51 mm size for these mufflers.
Will these bolt straight on?
No. Every bike needs its own bracket. Each muffler ships with a generic bracket to start from, but you should expect to cut, drill, and file it to fit. Plan on a hacksaw and a drill.
Will these fit my CB350 or CB360?
Yes, the inlet is the right size for those header pipes, and they make a good low-profile option. Mounting is still custom. If you want mufflers designed for the bike, we make dedicated CB350 and CB360 sets.
Will a CL350 or CL360 exhaust fit my CL450?
Not likely. The pipes may go into the head, but the CL450 frame is different enough that you will run into clearance problems.
Will I need to rejet after installing these?
Possibly. Any time you change the exhaust or the intake, jetting may need adjusting to suit. Tune to how your bike actually runs with its complete setup.
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Last updated: August 2026
