Muffler swap question
As long as you don't do anything on the intake side all should be good.
If you change the filter, get more air, then you need to start looking at a flash or tuner because you will need more fuel to go with the extra air you're bringing in.
The stock ECM should have some adjustability, question is how much and are you willing to take the chance.
Either way, if you're just doing mufflers making it sound better you should be good.
FWIW, do yourself a favor and check the roundness of each muffler (use a pipe expander if you have one). Sometimes they go slightly out-of-round and can be difficult to install and seal. Sometimes new clamps are in order as well.
Now comes the hard part, choosing!
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If I've posted it once, I bet I've posted it 43 times...
The FIRST thing a man should do when considering making changes is GET A TUNER. It will help a stock bike, and when you change pipes and or air cleaner, you're ready for it.
Top recommendations are TTS, FP3 and PV2. I run the PV2 myself
Can you run without a tuner? Yes.
Will you blow your engine up running without a tuner? Probably not.
Can you expect to get 50,000 miles out of your engine without a tuner? Most likely.
Will it run correctly without a tuner? No.
Dealers and their parts and service departments are a business, in business to sell motorcycles, and motorcycle parts and accessories. They tell you that you can get away without a tuner, because a LOT of guys won't come off the jack for a tuner, and they're afraid they'll lose sales if they tell you to get a tuner.
Changing the air flow without changing the VE tables is not beneficial. These bikes run lean from the factory, adding a more free flowing exhaust makes them run more lean.
Do what you want, I won't criticize, just trying to offer things to think about.
...but there is a reason I won't buy a used bike as my primary ride...






