Hey I have a 2014 street glide and I gutted the baffles is this gonna harm the engine in anyway or my fuel mileage I'm averaging about 38-40mpg with no baffles

 

Increased exhaust flow with no tuning changes will mean that you will be running a little leaner than before, and that was plenty lead as is. A tuner will help.

 

Actually, does not affect it at all. The ECM knows how much fuel to add. The oxygen sensors can read progressive updates from what is coming out.

An old wives tale that it does not. And modern bikes, especially the ones with cats are not tuned lean.

You would have been better off to have taken a 3/8 extra long drill bit and drilled a couple holes in the center baffle. Even that is pretty childish but now you sound like a 15-year-old with the muffler off his moped.

Both exhausts share each cylinder since firing is opposite and one drags the other, there is actually little back pressure.

If you read the spark plugs after 100 miles, there will be more different in them with the city and open road than with baffles than with and without them in the same kind of driving. The ECM know what it is doing. That is why modern engines only have one plug call out. Years ago, they had 3 or 4

 

Ok I talked to a harley tech briefly about it and he said the ECM is set from the factory and doesn't change

 

find another mechanic.
the ecm has a basic map set into it, old style was burned in, had to change ecu chip with new map. the new style has E2PROM which is electrically rewrite-able so a programmer is needed.
the ecm looks at the base map and the sensors and the decides what to do and alters the the base curve.
however, the system can compensate only so much and if out the parameter, it will flag a code or cause issues. for grins and giggles, say you force it to run lean, the O2 tells the ecm, hey dude i need a little more fuel here, the ecu complies by turning on the injectors for more time on. well if the rating of the injector is big enough, no problem but if it is iffy, the extra on time can cause heat issues and the injector could fail early. so, a larger injector rating is needed, sorta like putting a bigger carb on.

 

Alright thanks that's very helpful I'm thinking about just buying slip ons now and maybe a fuel pak

 

It's called open loop/closed loop. It is basically set as a canned map open loop with some outside temp variables till running temperature is obtained. Then the oxygen sensors and other controls come into play as a closed loop.

Same for cars. On a car, that is why they need a good thermostat so they run where they are supposed to.

What your TEC said is somewhat true. He is correct for my 2004 bike.

 

Good idea. Look at Power Vision instead of the fuel pak. Fuel Moto has them for $400 and will send you a good base map.

 

For what you did with the mufflers, the HD ecm is well within it's adaptive fuel parameters. Slip on's will also be fine - that ECM has a good amount of fuel trim available in relation to a pair of slip ons.