hearing bad things about no cat in header...took mine out 2010 ultra103,se air,sert,4in rineharts then dyno..????did i screw up??

 

I have a 2010 FLHTC, took mine out, no problems....and sounds better to boot!!!!!!

 

You should be fine, if you feel something is wrong get it dynoed. Should be a little louder, 1 or 2 hp stronger and definately cooler by you leg. you might be running a little leaner. You should get your AFR a little richer than what the factory set it at. Get a PC 5. I don't know if the SERT can change that.