Originally Posted by F.I. Inc. (Post 222272)

Yeah he def. went with the loudest option. It is quite a bit more mellow with high flow cats.

Originally Posted by m4a1mustang (Post 222329)

Well, my gf and I just got back from a weekend trip with the Z. 5 hours of highway driving each way. Let's just say I'm looking at sound deadening options. The sound really gets in and rattles your ear drums under load. The car is it's loudest/deepest at 2-3k which is highway cruising RPM.

Originally Posted by m4a1mustang (Post 222329)

On the highway the Z is definitely louder and deeper than my old Mustang that ran a non-catted x-pipe. Under load (say, in a mountain pass at 65-75 mph) the exhaust drowns out whatever your radio is playing. Pretty nuts.

If you can cruise at 80 mph (3k rpm) you pull out of that deep/droney zone and it's not bad, but anywhere below that kind of sucks.

Originally Posted by m4a1mustang (Post 222329)

Don't get me wrong, I love the sound of the car in all other conditions, but for us it was pretty bad on the highway. Not necessarily the volume, but it's just such a deep hum it gets in your head. Her hearing is more sensitive than mine, so it was worse for her. I can handle it if I have to, but I want to see if some deadening can cut down on the cockpit volume.

It's going to take a serious job in the hatch to cut down on that. Definitely going to add some heft to the car but it's necessary, IMO. Probably need a foam layer and some mass loaded vinyl to block out a lot of the noise... we'll see!

Originally Posted by MrBMW (Post 222598)

It certainly is loud and the good thing is Tony did warn us that it would be LOUD. As i have said before, at first i was like WTF, this is REAL LOUD. It has grown on me and brings a smile to my face every time i drive it now.

You can and personally I have done so, is to drive around the louder parts of the Rev range if just driving around in general. Also i would like to point out is that in those Videos above, is that you cant call that normal/easy driving LOL.



I'm going to having a longish drive on the Highway (2hrs) tomorrow and will see how the RTP's are affected. Although my daily commute is a 19km Highway drive which does include some constant inclines. As you stated it is loudest in that 2-3k band. This is ONLY when under load though. Another thing i have found is that when i use Cruise Control (our H/W speeds are 100km/h) it feels quieter than when i try and modulate the throttle.



Could it be possible that the US spec might have less sound deadening the us in Australia. I agree that it does get quite loud in the RPM/Speed band you mention, but not to the point where it completely overcomes the Radio/CD etc.. I believe i have quite good hearing and can pick very subtle differences in tone/volume etc..

I am very surprised about your comments saying the 370Z is louder than your Non Catted Stang. The VE Commodores (LS3 Engines) that i know run 2.5-3" straight through exhausts (like my RTP's) make me sound like a mouse LOL. Just the other day on the H/W sitting at 110km/h a V8 Commowhore (joke name over here LOL) was sitting next to me. No racing what so ever and i honestly could barely hear me over his exhaust.



The sound is AWESOME:tup::tiphat:. I remember in another thread somewhere around here, someone looking at doing the Boot's floor etc. So take out the rear carpet, spare wheel etc, etc and use something like Dynamat. This should dramatically cut down the sound issues i believe. When driving myself, i have noticed that this is the area that causes the most grief.

SRY for long post.

Originally Posted by kdo2milger (Post 222608)

:Burp:

Originally Posted by MrBMW (Post 222638)

?

Translation LOL.

Originally Posted by kdo2milger (Post 222644)

Originally Posted by m4a1mustang (Post 222329)

Well, my gf and I just got back from a weekend trip with the Z. 5 hours of highway driving each way. Let's just say I'm looking at sound deadening options. The sound really gets in and rattles your ear drums under load. The car is it's loudest/deepest at 2-3k which is highway cruising RPM.

On the highway the Z is definitely louder and deeper than my old Mustang that ran a non-catted x-pipe. Under load (say, in a mountain pass at 65-75 mph) the exhaust drowns out whatever your radio is playing. Pretty nuts.

If you can cruise at 80 mph (3k rpm) you pull out of that deep/droney zone and it's not bad, but anywhere below that kind of sucks.

Don't get me wrong, I love the sound of the car in all other conditions, but for us it was pretty bad on the highway. Not necessarily the volume, but it's just such a deep hum it gets in your head. Her hearing is more sensitive than mine, so it was worse for her. I can handle it if I have to, but I want to see if some deadening can cut down on the cockpit volume.

It's going to take a serious job in the hatch to cut down on that. Definitely going to add some heft to the car but it's necessary, IMO. Probably need a foam layer and some mass loaded vinyl to block out a lot of the noise... we'll see!

Originally Posted by kannibul (Post 222733)

Are you running stock cats or something else?

Just wondering...I typically don't drive it for a LONG time, but it seems that this car overall seems loud with the interior sound levels, to where I feel like I've got cotton being shoved in my ears while driving (overload?), and when I get out of the car into my quiet house, it's pretty dramatic the difference. I noticed this on my 2-hour drive from OKC back home...might have something to do with driver fatigue as well...

Might be that you're noticing that? (And I have OEM exhaust...)

Originally Posted by m4a1mustang (Post 222838)

Stock cats. It's really just that 2-3k rpm band that gets loud and DEEP that just slices through what little sound deadening we have and kind of rattles your brain a bit.

Originally Posted by m4a1mustang (Post 222329)

Don't get me wrong, I love the sound of the car in all other conditions, but for us it was pretty bad on the highway. Not necessarily the volume, but it's just such a deep hum it gets in your head. Her hearing is more sensitive than mine, so it was worse for her. I can handle it if I have to, but I want to see if some deadening can cut down on the cockpit volume.

Originally Posted by m4a1mustang (Post 222901)

It's a low frequency drone/hum so it sounds like it comes from everywhere. I think it's mostly the rear mufflers and the hatch, but it could potentially be the resonators and the X pipe right under the driveshaft tunnel.

I am planning on some dynamat, closed cell foam, and then some mass loaded vinyl to cut out on the noise from the hatch area and will see if that helps.

Originally Posted by Sonic370Z (Post 222938)

could it be the fact that the 18" res are "deeper" than the 12" res? or are they quieter than 12"? I didn't know if the resonators had more of an effect on volume or pitch?

anyhow, I have the same setup, 18" res w/ OEM cats and I actually want something a tad louder at times lol. I think this thing is perfect really. Sure it's a tad louder than one might expect at lower RPMs, but it's nice and deep and sounds good, but I don't think it drones at all, nor does it affect my music or conversation with my wife. She loves it too!

And once you hit 3k (cruising on interstate at 80 mph) I don't hear a thing. It's actually pretty quiet unless I downshift and really get on it. Just cruising along with this exhaust is perfect, especially at interstate speeds. I'm VERY happy because I drive a minimum of 60 miles a day between work and school, so having a relatively calm/quiet exhaust when I need it to be (interstate) and still having an available beautiful agressive note when I want to drive sporty, romp on it and have fun... this exhaust gives me both I feel. I'm very satisfied!

If anything at all, I'd possibly consider going to the 12" resonators (if anyone ever wanted to switch for my 18's). I felt the HFC's were just a tad too loud for me, so I assume the 12" CBE would be somewhere in between the 18" w/ OEM cats vs. HFCs.