It did a lot; although the exhaust still was insane with just LT's, X-pipe, and out the sides. It did reduce the noise from the car; road and body resonanse from the exhaust and stereo quite a bit.

I actually removed a generic layer of dynamat that had been installed, and worked very poorly, and didn't adhere well at all even when installed with a heat-gun.

 

i see you or the previous owner took the "easy-way" out and did the nice little fuel pump changeout throw the hatch....i had to do it to but my cutout looks like shiot

 

Actually the fuel pump was done proir to my ownership. I was very happy to see it already done when I lifted the carpet to do the undercoating. I was able to get all my interior back in today. I started my car up and its incredible how much it muffled the exhaust. I used to want to wear earplugs, now it doesnt sound much louder than a loudmouth or something equivilant.

I cant wait to get the exhaust to exit out the rear, there should be a huge improvement of sound quality once that is done.