If installing this under the hoodliner stops the heat from reaching the hood does this make the engine run hotter?

It will keep the hood from absorbing heat.In theory the hood is acting like a like a heat sink letting air flowing over it to help dissapate the hot temperature.But all it really does is deflect the heat down and around the engine.I used it on my hot running sports car and got no noticeable difference in engine temp.It did do a terrific job of keeping the hood from frying the paint.

For firewall application to reduce noise/heat would you recommend using Hoodliner on top of Dynamat Extreme or just this?

I recommend both Dynamat Extreme & this. That's what I did. It has held up now for nearly a year. That said, there was only about a 10-20% reduction of noise from my diesel. Most of that being higher frequencies. That's just the way of diesels though.

Does this work for high frequency eng/trans noise if applied to the floor boards or firewall and hood?

Not sure about high frequency, but it does muffle the engine noise. I have a cab forward vehicle (Jeep FC170) where the engine sits between the seats.

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DYNAMAT 11905 Hoodliner 32" x 54" x 3/4" Thick Self-Adhesive Sound Deadener – Made in USA

DYNAMAT 11905 Hoodliner 32" x 54" x 3/4" Thick Self-Adhesive Sound Deadener – Made in USA

Product ID: 3848772

Details

Brand
Dynamat
Item Thickness
0.75 inches
Material
Foam Aluminum
Product Dimensions
54"L x 32"W
Recommended Uses For Product
car

🔇Noise reduction up to 97%

🔥Reflects 97% radiant heat

🛠️Self-adhesive, easy install

₩350962

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Description

🚗 Silence the roar, feel the cool – upgrade your ride’s vibe instantly!

HEAT SHIELD MASTERY - Reflects up to 97% of radiant heat to protect your hood and paint
EFFORTLESS INSTALLATION - Self-adhesive backing sticks firmly to complex curves and surfaces
QUIETER DRIVES COOLER RIDES - Absorbs engine noise for a peaceful cabin experience
MADE IN THE USA BUILT TO LAST - Premium foam and aluminum construction ensures durability and performance
TRUSTED BY PROS LOVED BY ENTHUSIASTS - Used by top custom builders and hot rod experts since 1989

DYNAMAT 11905 Hoodliner is a 3/4" thick self-adhesive sound deadener made in the USA, designed to absorb engine noise and reflect up to 97% of radiant heat. Covering 12 sq ft with durable foam and aluminized skin, it’s trusted by automotive pros and DIYers alike for quieter, cooler vehicle cabins and long-lasting protection.

Specifications

ASIN	B00069QLVC
Best Sellers Rank	#126,520 in Health & Household ( See Top 100 in Health & Household ) #59 in Sound Therapy Products
Brand Name	Dynamat
Coverage	12 square_feet
Customer Reviews	4.6 4.6 out of 5 stars (630)
Global Trade Identification Number	00769103119056
Item Dimensions L x W	54"L x 32"W
Item Thickness	0.75 inches
Manufacturer	Dynamat
Manufacturer Part Number	11905
Material Type	Foam, Aluminum
Model Number	11905
Number of Items	1
Recommended Uses For Product	car
UPC	769103119056
Unit Count	1 Count

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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₩350962

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Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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TrustScore 4.5 | 7,300+ reviews

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