Hello everyone. I bought a 2007 IS 350 about 2 months ago and this forum have been very helpful when it comes to mods and maintenance.

I've done a few mods in the following order:

Interior dome, puddle, vanity, trunk, reverse LED lights
6000k Fog and low beam lights
6000k parking LED lights
Red-out for the amber tail light
2x JLw0 10" Subwoofer with enclosed sealed box and audiobahn 8004j amp

My latest modding project was adding dynamat to the entire trunk. I wouldnt have gone through with any sound deadening for my car if my girlfriend had not bought me the bulk pack of dynamat (36 sq feet for $124) from amazon for my birthday because its so dam expensive but I'm glad she got it for me because it did make a difference. The bulk pack consisted of 9 sheets but it was not enough to fully cover the trunk. I think I need about 2-3 more sheets. The difference is noticeable. I would say the trunk rattle heard from the outside reduced by more than 50% when I play music at the same volume before I dynamat. Inside, the bass sounds cleaner and less distorted at higher volumes. However, since i did not have enough for the doors, I still notice rattling from the panels.

I bought the dynamat door kit which is 12 sq feet that comes in 4 sheets to do the front two doors. After doing some research on cheaper alternatives, I bought an additional 50 sq feet of Rattle trap from Fat Mat on ebay for $80. I plan on using this to complete my trunk and on the inner and outer front and back doors.

My question to those of you who have added sound deadening to your cars is where do you think its most beneficial to add sound deadening after doing the doors and trunk? Would it be overkill to add another layer since i'll most likely have extra. How would you rate your experience with sound deadening before and after?

I look forward to hearing your critiques, suggestions, and experiences working with dynamat or any other sound deadening products.

 

I'd like to know the same thing.

 

i'd only do it to the trunk.. as its where most of the rattling comes from.. for the most part our cars are specifically designed to keep sounds from coming/leaving the cabin. of course adding dynamat to your doors do make a difference but you'd have to look at it from a pro/con point of view: adding all that dynamat will make your car feel like a benz(not in a good way).. you're just adding more weight and making the car a bit more sluggish.. you'd essentially be compromising speed/power for sound quality

 

but how much does all the sound deadening material really weigh?

surely less than 100 lbs? That's like .1-.2 seconds slower in the quarter mile, so if that meager loss of acceleration is acceptable, the benefits of sound deadening may be better.

 

I've never played with dynamat before but any way to make my car quieter is interesting to me. I don't really play my music loud or have any rattles in particular coming from the trunk--but would adding dynamat all over it make a discernable road noise difference for me?

 

probably not worth the extra gas you'd use carrying around all the extra weight.

Not to mention, making the cabin quieter will not help if you have internal rattles, which you may notice even more afterwards...

 

I will definitely complete the trunk area first. I understand that our cars are pretty well insulated to keep sound in and out however when listening at higher volumes there will still be rattling because the inner metal panels are thin. Sure sound deadening will add mass but it will also reduce vibration by connecting the metal pieces together (thats why its recommended to use the material in large sheets). The purpose of my project is to reduce rattling and improve sound quality, even if it means my car will be about 50 pounds heavier. I dont mind the decrease in performance 50-70 pounds will cause because there's always the ECT power button =P

Again, the priority is less rattling, improved mids, cleaner/tighter bass, and overall better sound quality. I know my sound system isnt the greatest since i was on a budget but this is my way of extending the limits of a budgeted amp/subwoofer.

For those who are interested in reducing road noise, I've heard thatit is recommended to add sound deadening to the floor panels with an additional foam pad. For me, road noise is not a problem because i feel that it is already quiet enough inside. Also, because i usually listen to my music at higher volumes, i the road noise doesnt bother me. But maybe with leftover sound deadening, i will do the door panels and will update you how that has impacted the overall sound quality. My packages should arrive tommorow so i can get to work.

 

lol your never going to hear the ambulance or Cops coming for you!

 

Here is my custom audio install that is using Stinger Road Kill Sound Dampening material. The trunk floor, side walls, and trunk lid were done as well as the interior rear deck and the front doors are next. https://www.clublexus.com/forums/lex...with-pics.html
I am a fireman and I do believe it's true that the newer more quiet cars make it more difficult for drivers too hear our sirens. Add a bit of a loud stereo and you can't hear much.

 

LOL opps forgot about the fire fighters!

 

Thanks buddy!!!!! Remember, were the "GOOD GUYS!!!"

 

Your project is an inspiration my friend =) Cant wait to see the outcome.

 

For the guys that said your going to suffer in the performance and fuel mileage.... Wow, well with that in mind guess we should all go on a diet, tell passengers they can't ride with us, remove the spare tire and when we have a flat we'll just stand there like idiots, remove the engine hood since it weighs so much, and lastly remove the interior panels and plastics.
GTFO of this thread with those ludacris statements of fuel mileage and loss in performance. 100lbs ain't *****.

 

I did the same thing to my car with road noise reduction in mind. The floor did the most of road noise reduction

But I used different kinds of materials

 

Although road noise isnt a problem for me, it does become noticeable on the freeway at high speeds. While I'm at it, i guess I can use the extra to do the floors.

What materials did you use? =)

Was it hard to do the floors? How much of the floor did you cover and how many sq feet did it require?