First off. Sometimes when I accelerate hard or turn I will get a squeak noise. Doesnt happen when I hit bumps I dont think, only when accelerating hard or turning. I think it comes from the passenger side front wheel well. I know that CV joint in that corner is going bad, because it started knocking and I am going to replace it very soon. Could the CV joints goin bad be the cause or something else such as my coilovers, shocks, etc? Also my friend sees smoke come out the back of my car. He says it is pretty dark, but cannot tell if it is oil or running rich. He says he says he only sees the smoke when I am above 4500rpm's. Also when I look at my muffler it is all black inside, and the back of my car has been getting dirty rather quickly with a layer of black. Would this be running rich at high RPM's or could I be burning oil? These are the two problems I recently started having with my car and I seriously need to get them fixed.

 

Also, I have a test pipe which I think may be the culprit but I'm not sure. I think I smell gas too sometimes, but its rare.

 

Yep, just ran it in neutral and took it up to redline. It smokes, might be white smoke. Smells like gas. Also when I step on the brakes or turn on my headlights, etc my idle drops by like 50-100rpms.