I'm trying to figure out what is causeing this poping sound from my sc300.

I only happens when I make a right turn at a speed over 5mph. It's one pop, that seems to be coming from the front of the car somewhere. It doesn't happen on left turns.

 

Not sure, but it may be your shocks going bad. I hear a pop from the rear passenger side on mine and two places have told me that the shock is leaking oil and needs to be replaced.

 

That could be your suspension screws not tightened to specs. Have your suspension been worked on recently? I used to hear a clunking noise on my rear passenger side after my car was lowered.
Brought it to the dealer. They tightened all the suspension screws and the noise gone. Cost me $150.
I should have asked the shop who worked on my suspension to reimburse me for that

 

Wow, I think U should have you're suspension checked. My boy had his Tein SS coilovers installed and it was popping everytime he hit a bump. We had lifted his car one night to work on it and I have lifted the wheel and whole Shock assembly for the hell of it and the entire shock tower would move atleast 2 inches. Turns out the shop that did his work had crossthreaded the bolts on top of the coilover and they have to replace the whole thing. Make sure U get it checked. Cause if it's what i think it is, it can do some serious damage.

 

don't know about those, but this sounds like the same problem http://www.mkiv.com/techarticles/fro...ise/index.html

you also might want to think about changing your bushings, it seems that our cars bushings are terrible, and you can pick them up very affordably.

 

Yeah Probably the lower control arm bushings.