I recently installed 18" wheels for my car. 225/40/18 tires 40+ is the spec if that helps.

Also I put back my stock muffler back. I'm also dropped on TRD lowering springs.

I just started to notice that everytime I go in a speed bump I hear a clanking sound from beneath the car, I did check on the bottom and it looked OK. the sound is like metal bumping to another metal.

Any ideas?

 

exhaust pipe maybe hitting something? maybe its not secure

 

i checked all those

 

Are you sure you secured the exhaust? A better indication of where the noise is coming from would be infinitely helpful.

 

quarter panel side, definitely coming beneath the car. most of the sound can be heard at the passenger side. only happens when i accelerate or hit a speed bump.. at 5mph

 

That's definitely your exhaust hitting something. I would double check and make sure you've got all the metal hangars secured and you're bolted up tight to the mid-pipe.

Did you leave the aftermarket exhaust hangar on? It could be bumping up against the muffler.

 

all aftermarket hangers are out. and I know i hanged all the stuff right because I did it and i didnt notice anything until 2 weeks later