Hey guys. I'm new to the forum, just got a crossfire a few weeks ago. One thing I noticed right off the bat is the quiet exhaust tone. So I was looking into getting a Megan Racing M-RS muffler to fix this problem. But before I got my crossfire, I have a Mit. Lancer OZ and I replaced the muffler on that. A few months later, the fix engine light comes on and the code reader guy says that the muffler let gases flow too freely and it damaged the cat. converter. Is this total bullcrap or the truth. I dont know. Does anyone have any input?