So my Rx8 Is running funny and I'm fearing the worst but hoping for the best! 2 weeks ago I installed a full TurboXs exhaust. It was running good. Until a few days ago it started to sound kind of boggy and raspy at take off and up to about 4k RPMs. Then it seems to open up and go but still sounds kind of raspy. My CE light is on, but its been on since installing the catless midpipe. I'm going to check for possible exhaust leak tomorrow but I highly doubt that's it. I had this same kind of problem about 4k miles ago and i replaced the spark plugs and that fixed it..until now. Any ideas?? Thanks in advance