Agreed, Aftermarket Exhaust and Intake help but a new cam set will surely make it come alive. Look into Woods Cams. Additionally, your SE probably came with a SERT for tuning and is married to the bike. It can only be tuned at your local HD when changes are made. You will want to look at the V&H FP3 so you can tune and make changes yourself.
There are a few good Forums out there for HD's that are very helpful but some of us here on the ODT have at least a little knowledge that we can offer, I think.
http://fuelpak.vanceandhines.com/
https://www.revzilla.com/motorcycle/vance-hines-fuelpak-fp3-autotuner-for-harley-2007-2013
We all want that HD sound but those of us that own them, know there is a difference between loudness and HP. Loud does not mean powerful and Fuel Moto has spent many hours designing head-pipes and exhaust that make the bike not only sound good but perform very well also. Not cheap but really well designed, tested and good.
https://www.fuelmotousa.com/
There are a few good Forums out there for HD's that are very helpful but some of us here on the ODT have at least a little knowledge that we can offer, I think.
http://fuelpak.vanceandhines.com/
https://www.revzilla.com/motorcycle/vance-hines-fuelpak-fp3-autotuner-for-harley-2007-2013
We all want that HD sound but those of us that own them, know there is a difference between loudness and HP. Loud does not mean powerful and Fuel Moto has spent many hours designing head-pipes and exhaust that make the bike not only sound good but perform very well also. Not cheap but really well designed, tested and good.
https://www.fuelmotousa.com/