Originally Posted by m4a1mustang

Dynamat alone won't do it. Dynamat just helps stop panel resonance and helps to get rid of some of the squeaks and rattles. Stuff like Luxury Liner, a mass-loaded vinyl sheet with closed cell foam is actually what blocks the noise.

You can totally DIY and save money. Dynamat is too expensive, anyways, so I'd use what I did... it's just as good and a ton cheaper.

But I'd just see if you are ok with the exhaust first... some people's hearing is more sensitive than others.