[tirwin]

Just getting back to this. Work had me busy for a few days.

Coastr, that is good info. I think we’re on the same page. My Mercedes is pretty quiet so I could use that as a comparison to baseline against. Just need to do some research on tools & methodology.

Keith, thanks for the pointer on the Etymotic ear plugs. I have not seen those before.

Bob, long story but I’ll try to be brief. I redid my interior maybe 5-6 years ago. I did the damplifier + CCF + MLV approach. I don’t think I did it properly in hindsight. I was trying to do enough to get some benefit but not so much to add too much weight.

Back then I had stock exhaust. The sound after the interior project was better than original but not what I had hoped to achieve. Later I went to a test pipe and 1-in/2-out muffler. The sound is awesome but it is loud. I might as well have no sound deadening — I don’t think it helps at all anymore.

I am now thinking about going to SSIs + 2-in/2-out muffler. I’m trying to figure out if I can find a decent compromise. There’s a lot of marketing around both exhaust and sound deadening. I’d like to see more hard data.

My basic premise here is to figure out the noise sources and whether spending money on sound deadening is helpful or a complete waste of time and money.