NYC test pipe help

mr37

What's up guys I have a MB 2010 z I just put test pipes on about a months ago. Everything has been smooth, a little rasp as expected but sounds great. I Didn't even catch a SES light. I was coming home from the beach last weekend, when I heard an extremely loud noise coming from the exhaust (it sounds like a honda just louder) along with a popping sound, it sounds unbareable and now the SES light is on. I definetly know its the test pipes but I don't know if it's something that's off or loose an O2 sensor idk. On top of that they guy that usually works on my car is on vacation so now I'm stuck without my z. Is there anyone in NYC area (westchester, Bronx, queens, Brooklyn etc) that can take a look at my car. If there's anyone that works on their cars themselves or knows of a shop that does exeptional work please let me know. Any way you guys can help is appreciated.