2023 FXLRST. I currently have you basic stage 2, cam, intake manifold, bigger injectors, air cleaner and 2:1 pipe, bike was dyno tuned and runs great. I'm changing the exhaust to another 2:1 with the same basic construction (1 3/4" to 1 7/8" to 2" to 2" collector to 2 1/4" baffle) the primary pipes are roughly 2" longer, muffler is going from perforated core to spiral louvered core and is 3" longer, same size muffler body. My dyno guy is booked out for the next month and I want to ride. There's also no one else in my area that I trust with my bike. Hoping to move the power band a little to the left and knock a few DB off the tone.
That's a long winded way of asking if the ECM would compensate for the new exhaust until I can get it tuned?

Thanks in advance

 

What are you changing from and to? I might be in need of an exhaust for my ST....lol.

 

taking off the SP Concepts Big Bore (I also have the Lane Splitter muffler) I'm open to selling the SP stuff, DM if you want to discuss it.
I'm putting on a pipe made by a guy in my hometown, killer fabricator/hot rod builder/exhaust maker. Small time operation, he builds one pipe at a time, fitting them to his Low Rider S to ensure everything works as it should. He tests them on his personal bike before shipping. He's been guided by a cople of heavy hitters in the performance Harley world and knows his ****. I'm stoked to have one and anxious to get it on and see how it performs vs the SP.

 

You certainly don't need a dyno tune just to ride the bike, and I'd be skeptical that there's going to be any major change in the fuel trims, but there's no harm in putting it on the dyno and finding out. But don't not ride your bike for the next month just because of that.

 

I switched from a Thrashin Supply AR 2 into 1 to a SP Concepts Big Bore 2 into 1 on my Stage 2 114 Street Bob. Changed the sound but no problems with the bike's performance. Maybe a bit more power. I have a Thundermax and it has handled the change without any issues.