No backfiring ever, but is lazy off the bottom, but that's just an 883. Can easily be fixed with a few simple mods. Breathing is the key.
For new DIY guys (and girls), Number one rule is to always maintain the bike on a regular basis.
Make sure it is tuned right (especially if you do mods to it). Don't skimp on parts. Oils ain't oils, etc, etc...
Also make sure you get a manual and take your time. Check and double check what you're doing and be realistic about your ability. If you're not sure how to set the valves, don't try to rebuild the engine.
Don't be afraid to ask questions. For every question you'll get 3 different answers most of the time. Learn who the guys in the know are, and listen and learn.
I run on open air element K&N air filter, 1 3/4" drag pipes with 6" baffles and torque cones and never any issues.
Girls bike? Let them ask that question again when you leave a softail eating your dust. Hahaha...
Keep your knees in the air and rubber side down.