2009 Electra Glide Classic

I have a stock engine with no changes to air flow. Just put on a set of 4.5 pro muffler slip on's from Fuel Moto. How can you tell if you need to tune the engine or just leave it alone?

Tech's say if you don't change air intake everything should be good.

Also, it depends on the engine itself. Some make the adjustments it needs and some don't.

I just don't want to damage the engine. Again, is there a tell tell sign that might question the engine's ability to compensate for the change in less back pressure?

Thanks for your help!

Paul

 

The best way is to look at the plugs. If they are white and chalky the bike is running lean. Your ECM should compensate just fine for the slip on's. If you add an air kit then you will need to get a tuner.

 

That method is pretty much non credible anymore due to the advancement of fuel injection and better fuels, machining, etc. What the tech said was correct. Exhaust change wont affect af ratio. It will just change backpressure which has an effect on the powerband. Tuner is not needed for slip ons. But tuner is definitely worth its price in gold. That was the first thing I did to my bike.

 

That makes a lot of sense. If you want the power back you need a tune.

I am sure I will be doing a tune real soon.

Thanks for input!!

Paul