This is a duplicate post from another section, but Im trying to find the best place to put this. I really need some help.

I could use a hand. I have a noise, either from the CVT or the engine itself, and nobody (not even the dealer), can figure out what it is. You can heard it when accelerating in Sport mode, at certain RPM/Gear spots. I have posted the link to 2 videos, one in neutral, the other in Sport mode. I could really use some suggestions here, cuz it is driving me NUTS.
Thanks
PS: It got more noticeable after I just had my new exhaust installed today. Also, had my resonator pipe welded, due to a small leak.

2008 Lancer GTS

 

Have someone look under your car while you do that in neutral (tires blocked/ebrake for safety). My guess is it is your exhaust rubbing.

My Tsudo exhaust would hit my diffuser during idle and high rpms. Cut a little piece out of the diffuser and it went away.

 

I believe I answered you the same 2 weeks ago, you said you had exhaust work done. Check your exhaust, like I and the above poster said, it's probably something rattling off something else at certain rpms, that sounds somewhat similar to something that happened to me, I went back under he car and just tweaked it because my resonator was rattling against the heat shield.