after driving for a few minutes i hear a very annoying rattle coming from underneath the car. i tightened all all the bolts on the cat and muffler, but it still rattles (usually when i rev over 3). Also, when i drive over bumps, or over a rough road, i hear a squeaking and a bit of clicking around the passenger wheel. And when i am driving and press the clutch down and get ready to shift, i hear a bit of a buzzing sound. And once in gear and accelerate there is a similar clicking sound for a moment. Driving with these types of noises is very annoying, and seems a bit unsafe, so if you know the problem of have some advice please share, thanks.