So the other day, before I went to work, I noticed that after starting my car, it began to make a weird sound. Usually my Sentra is real quite, but for some odd reason it's not now.
After browsing through a couple of videos on here, and the web, I've come to the conclusion that it's either something bad gone wrong with the exhaust itself, such as that there's a crack somewhere, or the catalytic converter is bad, or that I have the dreaded piston slap found in the Nissan 2.0L engines.
![](https://s2.save4k.ru/pic/EgnqWRtPRcI/maxresdefault.jpg)