First, Let me tell you about my car. I have a 97 Civic Coupe. I have for sound a Blaupunkt head unit, Khoiler 4x100 amp w/ variable crossover, Blaupunkt 6'' 2ways getting the mid to hi range in the front, Sony 3 way Xplod 6x9 getting mid to lows in the back, Explore(p.o.s.) 400 wattx2 for 2 Rockford Fosgate sealed subs in the trunk. I replaced the "floor" of my trunk with 1/2" MDF and bolted the Sub right to it with some brackets. I screwed some old carpeting to the bottom of the MDF to keep it from rattling around. I have dynamat Extreme lining the underside of where the 6x9 are and its also on part of the trunk lid.
The interior of my car is absent. I have taken out my entire rear seat and quarter panels to do some modifications to the wiring and to retrieve pieces of my side moulding clips from when I broke them off. I did put the rear dash back in. It rattles a bit without the quarter panels to hold it down securely, but it doesn't really when all the interior panels are in place.
I have a stock everything except suspension components. Stock tires, exhaust, motor etc.
My car is pretty loud when I drive and I cant remember what the interior sounded like with the rear panels in. I can really hear the wind blowing past the holes for the side moulding clips. I also get all kinds of tire noise b/c there is nothing between me and the rear fenderwell pieces.
My plans are to put in a JDM H22 and build and turbo the shit outta it cuz I like going really fast just like everyone else here. I want to keep the car for about 5-6 years, especially if Im gonna put this much $$$$$$ into building it.
My question is, should I put Dynamat in to help deaden the road noise while driving? I see alot of people put it over the entire floor, doors, and rear quarter panels, as well as the trunk. Im sure this virtually eliminates road noise and really helps the sound quality of their stereo system....but it adds a lot of weight. Would it be worthwhile to do the entire interior of the car, excluding the trunk, or should I put it in certain places i.e. the big holes in the rear interior quarter panels, and the doors and floor in an effort to keep weight to a minimum? Anyone with any advice would be appreciated.