Underhood liner
 

I'm interested in further reducing noise in the cabin. Already Dynamatted and foamed key cockpit areas. Wondering if anyone has added insulation under the hood (above the engine). Dynamat and others sell a hoodliner and they recommend using Dynamat extreme to reduce noise. Does it stay in place long term?
:driving:Thanks.
Cheers

Have you done the roof yet?

No. I did the rest of the car myself, but have been avoiding the roof as I would like not to venture into airbag territory. The reason I want to reduce engine noise is the engine noise. I love the car and plan on keeping her long term, but that growl from inside in first gear does not exactly provide confidence.

I just worry about under-hood temps. Aren't hood liners required in some European countries?

I think you bring up a very relevant point, but I'm not sure what the laws in Europe are regarding hoodliners. Is there a particular country you are interested in investigating further?

Infiniti sells a G37 hoodliner they call an insulator pad, but am not sure if it would be a direct fit for the Z. It comes with clips.

Dynamat Hoodliner and Extreme Under the Hood
 

Just completed Dynatting the hood. First placed Dynamat Extreme in strategic areas under the hood. Specifically placed in the open spaces where the metal is the hood, not the frame. Then measured, cut and installed the the hoodliner. Used metal insulation tape around the perimeter to give it a more finished look. Everything took less than 30 minutes to complete.
Test drove it and the first thing I noticed was the elimination of that truck-like sound in first gear at higher rpms. The sound we all know and auto journalist complain about when reviewing the car. The cab is significantly quieter and the mechanical noise has moved from the engine to the rear rear of the cockpit and specifically exhaust note.
This worked great on my car. I also think I gained an additional 8 horsepower at 5250RPMs.
Cheers.

:tup:

notice any oil temp change or engine temp( increase or decrease)

I'm not going to be tracking my car so a few degrees upward should not affect performance or longevity. Also, I don't recall reading that Nissan chose an aluminum hood without a liner to dissipate engine heat. Everything I've read is related to weight (and keeping costs down). Additionally, check out the G37 with our same engine and a hoodliner.