Persistent popping noise, Spent over 1000

Ive replaced both outer tie rods, driver inner tie rod, brand new tein coilovers, got alignment, and still it makes a thud/popping noise when I turn my steering wheel at certain times, replacing the inner tie rod is the only thing that has made it better, it does it less but still does it, the sound and feeling is coming from the drivers side mostly, I think i need a whole new steering rack but my mechanic disagreed and said it was the inner tie rod because half way down the stock rod there is crimped connection that would shift when pressure was applied, so he thought it was that. This new rod is one piece and doesn't even have the crimped connection to make that same argument, so I'm at a loss , PLEASE PASS ON YOUR INFINITE KNOWLEDGE!!! Thanks guys

Persistent popping noise, Spent over 1000