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cptmoney 10-02-2012 08:52 PM

Need mufflers - options for a '74 Honda CB350F
Hey all -

I've got my boys working on an old 1974 Honda CB350F, but we need some muffler options.

The PO hacked off the original mufflers, so now we have none. Header pipes are there, but are cut off right where the mufflers would bolt on (so I THINK).

I'll post some pics tomorrow, but thought I'd get the ball rolling while I was thinking about it.

Any ideas? We can't find anything - nothing, not even used. Can you steer us in the right direction? What can we use? Stock look/sound is not mandatory, just something to knock off the edge off the sound.

bones_708 10-03-2012 06:17 AM

You need to give a little more info. What was the exhaust that was on the bike? 4 into 2? 4 into 1? stock? Straight? You can find universal mufflers easy enough but are the pipes really set up so you can just clamp a muffler on the end?

Regardless the easiest way to see some different types is to simply type universal motorcycle muffler into ebay and check out what you see. Know the pipe size before you check but if it's simply something to quit the bike down a bit you can find it there.

noman 10-03-2012 05:29 PM

mac has an exhaust system for your bike, not cheap. and check out the classifieds at

cptmoney 10-04-2012 07:40 AM


Originally Posted by noman (Post 19740336)
mac has an exhaust system for your bike, not cheap. and check out the classifieds at

That's what we need, but can't swing that kinda dough for this old dog.

I'll shoot a few pics to give you an idea of what we have right now. You guys don't have enough info to help me make a good decision. Perhaps tonight. The boys aren't coming over this evening, but I can still snap a few pics to give you an idea...

hoodellyhoo 10-04-2012 09:48 AM

Mac is the cheapest new option you will find. Otherwise you're either going to have to wait to find something used or build your own. Maybe find a couple 2-1 collectors and throw on some cheap emgo mufflers.

cptmoney 10-04-2012 08:58 PM

Here's where she stands right now:

The exhaust pipes/headers come back to just behind the engine....then nothing.

Is that far enough back to use a 2-into-1 connector, then a general purpose muffler? That's fine by us; we just need something to tame her down a bit. A universal application muffler or two would be great with us - especially since these projects we work on operate on a near-nil budget.

What do you think? See anything obvious? Where can we find the necessary connectors? Are the existing pipes long enough to make do?

bones_708 10-05-2012 09:14 PM

it is far enough to use a 2 to 1 connector but the cheapest I know of premade steel for motorcycles would be $100 each side and then the mufflers. has some and even does custom orders. since most mufflers will cost you at least $50 your looking at 300 and in the range for new exausts anyway. Looks like it was a 4 into 4 with the slight upsweep of the inner pipe (maybe) so even with just mufflers you would run over 200 with universal megaphones but most likely it would work. makes some that are much cheaper but require much more fab work.

cptmoney 10-06-2012 05:53 AM

Yikes - that's not good.

The mufflers would be worth more than the bike! No wonder the PO let it go so cheaply....

We're going to have to regroup a bit on this one. Maybe scour about for some used alternatives.

Thing is, they didn't make this bike for many years, and I'm not sure what alternatives we'd have. Does the CB750 utilize the same exhaust? I can't imagine that they do. Anyone know for sure?

Sheesh - this isn't looking good....she's going to have to hit the auction block as-is if that's the case. Poor ol' bike just isn't going to be able to keep her head above water at this rate.

ReCycled 10-06-2012 06:07 AM

Time to learn how to fabricate 2-1's if you don't want to spend MAC money;

lake_harley 10-06-2012 06:31 AM

Here's a few pictures of a 2 into 1 system I built for a CB175 that I owned. It's not quite finished in these photos but you can get the idea. I used mandrel bent sections with matching diameter and wall thickness tubing, all cut and fitted, then TIG welded together. Lots of hours and patience, but I think it turned out well. I built the muffler for it as well, but anything aftermarket that catches your fancy could be used, just a matter of matching ID and OD of tubing so things slip together where needed.

Obviously, you'd have to do everything X 2.

hoodellyhoo 10-06-2012 08:52 AM

Have you checked out There's this guy selling an exhaust. Don't know how loud it would be.

cam14 10-06-2012 09:17 AM


Originally Posted by lake_harley (Post 19760243)
.... I built the muffler for it as well,..

Nice job on the whole system, what did you use for baffling for the home made muffler?


YOUNZ 10-06-2012 09:34 AM

You can buy e-pipe reducers of all sizes at most auto parts stores to fit different dia. pipe together. Tractor Supply has a cheap range of mufflers.

lake_harley 10-06-2012 10:20 AM


Originally Posted by cam14 (Post 19761065)
Nice job on the whole system, what did you use for baffling for the home made muffler?


Thanks for the compliment. As far a baffling, the best as I can remember the inlet tube extended 1/2 way or more through the body of the muffler and had a lot of holes drilled along it's length and all the way around. It was capped off, so to speak and the cap was about the diameter of the inside of the muffler body, but had a ring of holes to allow the exhaust to flow between the "front and back" part of the muffler. I can't really remember how far the outlet tube went onto the body, but I think it extended in part-way and was also drilled to allow a lot of different passages for exhaust to get to the outlet and eventuall the down turned spigot. The whole idea was to break up the exhaust flow to "homogenize" the exhaust pulses into a more even flow. Compared to the sound straight out of the merge collector, it quieted the exhaust a lot.Performance compared to stock, I doubt there was an increase, but to me it had a "cool factor" racier look, sounded better, and was way lighter than the stock double mufflers.

It was fun to build and I'd like to do similar exhaust for others in my fab shop for a reasonable price, but I don't exactly live in a highly populated area where there's a lot of demand. Too bad I don't have a salvage yard full of bikes to use as "jigs" to do custom exhausts.


cptmoney 10-06-2012 11:22 AM


Now we're talking!

At the VERY least, the ebay link saves us a cool hundo, right off the bat.

It would be very cool to manufacture our own; we've never down any of this....but I guess it's never too late to do some additional learnin'!

Awesome. I like where this is headed...We're still a good bit from being able to make our own, but I'll check in at the local auto parts place to see what sort of collectors I can chase down. We'll start there.

And the Tractor Supply source for mufflers? Whoa - great selection at smokin' prices. That will be very useful for our project.

Making progress with it all now....

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