Well, I had my exhaust pipe welded about a onth ago as it fell off while driving. I now can hear the exhaust getting louder inside the car almost if I have a hole in the system somewhere. Hopefully It won't take much to fix.

Welding exhaust is tricky business, you need enough penetration to get the welds to hold, but you can very easily burn through the thin walled pipe. it may just be leaking where you previously fixed it, in which case you may be able to get the people who did it last time to do it again for free.

Im going to have them check it out to see whats actually wrong and see if he will do it for free.. Hopefully haha