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Message: <blockquote data-quote="defcon1" data-source="post: 1794896" data-attributes="member: 30064">The results... ... <img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/laugh.gif"  class="smilie" loading="lazy" alt=":laugh:" title="Laugh    :laugh:" data-shortname=":laugh:" />The noise level in the car is significantly reduced. How much is hard to say since my ears have never been calibrated by Sirim, but let me describe the effect and we will venture a guess later...a) Before soundproofing, the most distinct sound in the car was my muffler. This was because of the addition of a Y-pipe and the replacement of the stock centre silencer with a bullet. The sound was a low growl that used to fill the cabin.b) After soundproofing the boot area, this exhaust sound was greatly reduced. I would venture that the level of this sound went down by at least 60% - 70%. At that time, and this was confirmed by Ong, that most of the noise now came from my floorboards, slightly in front of the front seats.c) After this last bit of work, i.e. floorboards and front doors, the sound level in front has been greatly reduced and the most distinct sound(s) in the car are now split between the muffler and the front firewall. I used not to be able to hear my signal light relay clicking...now I hear it distinctly. Mostly, I can now hear my tyres.Street noise is also greatly reduced. Passing motorbikes no longer rattle my rear view mirror. Passing cars hardly register.When the car goes over bumps, it used to send a distinct "clunk" through the frame of the car. Now, the car appears smoother, less vibrations, and the "clunk" that usually follows going over imperfections in the road has been reduced to a "dub"...almost like a new car. A lot of irritating clicks and squeeks have also dissapeared. Overall the chasis feels firmer.The overal level of vibrations going through the frame of the car, and felt by the driver through the steering, feet and behind are reduced by at least two-thirds.Conclusion : I would estimate the noise reduction level is in the region of about 70%. Doubling the bitumen on the floorboards and firewall would probably have resulted in about a 5% better performance, so you will have to decide for yourself if this is economically viable.Noise coming through the firewall is probably because I only layered about half-way up the firewall. In order to do the entire firewall, I would have had to take off the dash...which is not the kind of thing that a casual diy'er would want to do as it would probably take you 2 - 3 days to take it off and put it back on again. The solution I will probably try to take might be to improve the soundproofing of the bonnet, and maybe the upper firewall in the engine bay. I'm still considering the type of material to use for this.I suspect the muffler sounds coming from the back will be improved by soundproofing the rear doors (which I left for another day), and the metal bulkhead separating the passenger compartment from the boot. There is also the possibility that the metal under the rear seat needs another layer of bitumen. This might be the next weekend's project.The tyres, however, will be another problem entirely. Some people go so far as to dampen the entire mudguard (above the plastic wheel-well mouldings), but as this is an external part of the car, application of the bitumen has to be very proper with really good surface treatment to ensure that the bitumen stays.Another possibility, and one which I will probably try out, is to layer the plastic wheel-well mouldings with Insuflex. This might actually work, as there is little in the form of noise absorptive materials in the wheel-well.Will continue when I get round to doing the rest of the car... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1425" alt=":smile:" title="Smile    :smile:" loading="lazy" data-shortname=":smile:" /></blockquote>

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Boost drop problem , pls advise .

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