Please, before you point me in the direction of the search feature, which btw is an amazing tool, let me explain my situation. First, this is NOT a drone issue with AFM. I say this because I just spent the last two hours reading about drone issues and sound deadening. My car has it tuned out. Now, with that being said, I would like to lessen the in-cabin noise I have with my SLP Loudmouth Axleback. I do love the exhaust note and sound of the SLP. However, there is a significant increase in interior exhaust noise. Of course this is probably contributed to the fact I have Kooks LT's, Kooks X-pipe to the SLP's. But, I would like to know if anyone has reduced the in-cabin noise with MLV or some other type of sound deadening etc? If you have. What did you use? How much did you use? Lastly, how much did it cost? I don't want to change exhaust, though I know I will probably have to put stock mufflers back in when it comes inspection time. I merely only want to keep the exhaust noise on the outside, so I can hold a conversation on the inside. Any advice is greatly appreciated.