Soon after I purchased my 2022 LRS I put on cat-less V&H slash cut slip-ons. I also purchased a HD Street Tuner and cable. However, I never opened the tuner and tuned the bike. The bike runs fin and I have about 6k miles.

Recently, I put on a K&N air filter and noticed some run improvement, but a little more back firing. I was going to tune my bike with the HD street tuner, but I heard it will only tune HD/EPA compliant product which my slip-ons are not. I also heard that you can't safe your previous map, when you re-map it. I don't want to have a shitty map without a way to go back.

Do I have this right? If the HD Street tuner won't really help me, I will sell it as it has not been opened or locked to a VIN. But what is a good tuner to use? I saw reviews that t think the newer FP-4 wasn't very good and the dyno-jet is $600. And do I really need a tune for a high flow air filter and de-cat'ed slip-ons?

Thanks