thanks for the info guys that helps out a lot. I havent changed my diverter valve yet and I have had the car 5 years. I did get the free tune as well and everything was working great until i was near the end of the free tune, then it sounded loud when i gassed it and the engine just didnt sound right. I threw a check engine light and pulled the code but now i cant remember what it was. I cleared the code and about 30 mins later the free trial was up and the noise went away and the check light nver came back on.