I have heard a few people complain about this in the past so I though i would share what was the problem. (for me anyways) So about 4 months ago, I noticed that when I would turn left or right, didn't matter, My front wheels would make a whomp whomp whomp whomp sound. My first thought was most likely like yours, forsure its gotta be the tires or something to do with the alignment right..Well I spent 800 dollars on brand new tires+balanced and a alignment thinking for sure this would fix the problem. Well I get it all done at the tire shop take off and what do you know, same sound. So I say **** it and take it to the dealership witch I was kinda afraid cause of all my mods plus its still under warranty. The service manager found my meth injection,polished 2.8 pulley,Ingnalls E.D, and ofcourse my Injen CAI.(That was all fun as hell to explain,the conversation was actually kinda funny) Turns out its the front right wheel hub. Anyways its getting fixed for free.