I have the v-4 crawford plenum (NO ENGINE COVER) and the Injen intake. Let me say that while I enjoy the mods the noise that they made when combined provided a rather noisy experience in the cabin. I like engine noise but some of the diesel sounds and the odd sounds that I think simply are drivetrain noises seeping through the thin aluminum hood, are plain old un-desireable. The plenum made idle sound like a camaro and the engine gurgles a little..soooooo.

I put in some B-quiet H liner fo 55 bucks shipped and viola...all i hear is what i want to hear. With the 7 wire kit and all this new sound insulation my idle is barely audible..it went from annoying thanks to the non-normal un-rythmic engine sounds the crawford gave me to being simply wonderful.

I hear the noise from the back of the car now..this stuff is great. I cut out one layer for the shape of the hood - I put it right over the existing liner to give it another layer of insulation (sticky stuff) and then cut from the remaining material, three strips that fit perfectly from front to back of the hood but only up the middle where the plenum is as well as the all the belts and pulleys. So there are 3 layers of insulation in the middle and the sounds deadining is amazing. My girlfreind thinks the stuff is great too. Forget all the other brown bread unless you are improving the sound system. This is the answer and I am surprised I have heard of no on else's success.

I admit I was skeptical but after thinking about why basic foam covered in heat reflective covering is any better than stock, the reasons seem obvious. The AL hood! That thing is like a resonator for the intake and the plenum which is about 2 inches from the middle of the closed hood. Now even when the car is open or if you stand outside by the engine compt...the thing is quiter. And it still has the roar I want to hear when you punch it...It seems loud the way it used to at 5000 and when cold but no more ticking or diesel sounds and esentially no sounds at all other than the purr you want to hear below that...great money well spent.

 

Sound pretty good. I might give that a try too.

~ GT-R the Ultimate Driving Machine ~
- 2004 G35 Ivory Pearl/Black Leather
- Auto/Nav/Premium/Sports/Aero
- 6 wire grounding kit

 

That sounds really excellent! A few of us have been looking for this kind of solution.
I've used brown bread for some door insulation and a little bit in the trunk. It helped, but not a ton. Brownbread is nice because it's very thin, easy to work with and can therefore fit into small spaces.
I will look into the B-quiet for the hood and other spaces (maybe the firewall area as well?).

jjellyneck

 

Yeah this stuff is thicker but it fits fine if you can live with out the engine cover or cut - to - fit. I thought about the firewall but I dont want to be insulated completely and there are few spaces for it in there unless it's all cut up and would look pretty rough.

While about 3/4" thick - its the best improvement i'd have ever imagined!

 

3/4" thick!!! Wow, that is pretty hefty. I was thinking of just putting some dynamat or brown bread under there.

With it being that thick, can you still use the stock engine cover with it??? I would prefer to be able to keep the engine cover instead of having to get rid of it. Any ideas???

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I think you could cut around the area where the engine cover gets close to the hood up front. You could also remove the existing insulation for more clearance and just do one layer. I'm sure that would still result in better noise levels. I think brown bread would melt but am not sure of the tolerance levels for heat. The b-quiet.com site has the db reductions at various temps for most products and this one was far superior.

I was more into sound than looks...i got rid of my cover after my first mod and i overtorqued the cover and the plastic broke around the bolt...(reason i work in an office). I think the cover retains heat and vibrates personally but some go to great lengths to keep it on there and upgrade it as well. The install can be modified for anyone since it's up to you to figure out the cuts and the application. The sky is the limit...i doubt there will be more success than the 3 layered effect i got tho. Always a tradeoff..

Also this stuff is spongy and flexible so even if you did the layered thing your cover would indent the stuff and fit ok as long as the hood wasn't being pushed too hard..
<P ID="edit"><FONT class="small"><EM>Edited by SixFive on 03/22/04 09:52 AM.</EM></FONT></P>

 

Well, i am not sure about the brown bread melting. It's tolerance is up to 293 *F which seems like it will be sufficient. I think I may try your approach and see how that works. If I want to later, then I can get some brown bread and do the rest of the car. If you don't mind me asking, where did you buy the hood liner from???

http://usastreetracing.com/images/vi...aos2teaser.wmv



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Nice job finding this material.

Have you been able to take any pictures of how it looks installed? I'm assuming that the 10.5 sq. feet option was enough?

2003.5 6MT Brilliant Silver G35 Sedan
Injen CAI, Crawford Plenum, Stillen Exhaust
<font color=blue>GroundingGear™ Equipped</font color=blue>

 

Thanks

I got 13.5 sf - it was more than enough to cover the hood once and then the middle section (24") again with some scraps left over. Check out b-quiet.com - it's called the H-liner.

Unfortunately we(SHE) lost 2 digital cameras in since last summer. I will try to get another camera over to the house this week and show u guys pics of my less than perfectionist workmanship. Actually this stuff is out of the box and in the car in 5 minutes. The only problem is getting it adhesed without help. It's very sticky.

I will say in light of no pics that this is not bad looking but if you llike the tightest cleanest looking hoods up view around - this may seem like a puffy combs shiny jacket for your hood. there are also some install pics on a Sebring on the bquiet site. Hope that helps...

 

Post pics!

2003 BLK/BLK 6-spd Injen clear corners