[RustyTeeth]

Cut new piece of space pak. Double insulated and ran flexible metal duct tape. Amazon has  Few thousand miles still holding. Used 3m ultra strong headliner spray glue after light scuff with sand paper so glue can grab, and alcohol cleaning. Made the entire hood more ridged  and quiets everything down. Obviously not the blow off valve!
     

Here is what I used US Energy Products (3MM Reflective Foam Insulation Shield, Heat Shield, Thermal Insulation Shield Radiant Barrier 16" x10ft 12.5sqft (One Pack)
Brand: US Energy Products
[i]4.3 out of 5 stars[/i]    280 ratings
$16.88$16.88

• One layer closed-cell foam bonded between two layers of highly reflective metalized aluminum polyester film. Industrialized strength, lightweight yet durable insulation designed to hold staples without tearing. Does not compress, collapse or disintegrate. Reflects 97% of radiant heat, emits less than 3% of heat, Class 1 / Class A fire rated radiant barrier that has passed the ASTM E84 test & ASTM E2599
  
  
• Non-toxic, non-carcinogenic, fiber-free, safe to handle and does not require protective clothing or respirators to install. Easy to install and maintenance free, cuts easily with utility knife or scissors and installs easier than fiberglass. Simply staple, nail, glue or use a spray adhesive to hold in place! No mess, and no itchy fibers!
  
  
• Not affected by moisture or humidity. Inhibits condensation and does not promote the growth of fungi, mold or mildew. Does not promote nesting of insects or rodents. Non-flammable, flame retardant
  
  
• Saves energy by reducing the stress on heating and cooling systems, keeping your home warmer in the winter, and cooler in the summer. It can reduce utility bills substantially all year round. As well as provides benefits of soundproofing when used in walls, ceilings and floors. Can also increase your overall property value depending on use.
  
  
• Made in USA / Class 1 Class A Fire Rated / Waterproof