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Honda: INNOVA125i(2010); CBR250R(2013)
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Are there any sub $100 slip-ons that will not require me to get a Dyno with a complete ECU remap
Those who runs after performance improvement will usually also be the one who rides hard at high rpm most of the time. In this case the re-programming of the ECU is important for two purposes: 1. Taking advantage of the change in exhaust for performance improvement. 2. Increasing engine life. Just remember: Engine life is a relativeiy, because whoever rides hard at high rpm his engine will not last long.
does anyone know the pipe diameter?
These are the dimensions I take from NEW MUFFLER GASKET 18392-KYJ-901
("where it slips on to the rest of the exhaust "):
I.D. 38mm
O.D. 44mm

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Essentially, I just want something that won't interfere with my swing-arm stand and has a half-life greater than one riding season.
I would try to order an pipe adapter and Muffler hose set from AliExpress, from 100USD you will get a money return.
I find it interesting. It is not clear the quality of the materials in terms of rust etc.
But the good price is for sure.
 
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Just muffler swaps won't give you much, if anything at all.
Not necessarily.
As our model get oldy and the miles are collected, so does the catalytic converter get clogged. When the converter is clogged you have two options to open it:
1. To greet him out by welding work (LINK), Or...
2. You buy a new one.
At the new one, if it's not the original muffler (neither expensive nor cheap), you do not have a catalytic converter.
The difference between a clogged catalytic converter and a free gas passage is a difference in power, a noticeable difference, a difference that does not require any "dyno-tune and re-program " of the ECM, is just there, there is more power available to use.
 

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I'm a firm believer in keeping the bike stock as much as possible...
How "much as possible"?
You have 6 options: 1. Stick with what you have now (Sorry, I did not really understand what is your problem with it). And this is also the cheapest way 2. Buy a new OEM muffler that includes a catalytic converter, a really quiet exhaust. 3. Take a bad used OEM and remove the blocked catalytic converter. 4. Buy used OEM in good condition. 5. Buy a new generic aftermarket exhaust without a catalytic converter. 6. Buy a used generic aftermarket exhaust without a catalytic converter.

... Adding power almost always results in a shorter lifespan.
YES

... the proper procedure for replacing a muffler with an aftermarket one is to get the ECU programmed and the bike Dyno tuned. A bike will still run, just not up to it's optimal potential.
It is impossible to talk about "optimal" for a issue that is irrelevant for you.
It does not exist "right or wrong" fo your issue!
Your decision is related to what you want to achieve?
If you are not interested in power, and if you do not intend to ride hard, the whole issue of Dyno & Tuned is not relevant for you at all. Besides, there are dozens of other parameters that relevant to performance improving , therefore, there is no meaning to dealing only with the issue of muffler. It's meaningless for you, right or wrong? For you this is not a question that comes close to being relevant.
 

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Big Cahuna just wants to get a smaller pipe for short money...
NO
Essentially, I just want something that won't interfere with my swing-arm stand...
I probably did not understand, and Big Cahuna currently has the original muffler. OK
I think that in such a case the best solution is what you bought:
T-Rex Racing Honda CB300F / CBR250R / CBR300R Spool Adapters (t-rex-racing.com)
And order for the stand a pair of forks instead of the spoons
 
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That was helpful. I went online and looked. I came across another type which screws into the back end of the swing-arm. I just bought it and it came well under the T-Rex system. Including tax and shipping it was $19.52. I'll post a review after they arrive and I have had a chance to use them.

View attachment 45356
The type which screws into the back end of the swing-arm
is NOT good.

It is not possible to adjust the chain slack with it, and it is not possible to lower the rear wheel with it, this is a very limited solution.
How to mount swingarm spools
T-Rex system is GOOD
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Tire Wheel Vehicle Crankset Bicycle wheel
 
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