I insulated the bare hood/bonnet of my retired Peugeot 106 with dense rubber foam, with aluminum coating. Reflects and insulates both heat and noise.
More in this thread:
Piwoslaw's Peugeot 106 thread
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is
where you're going, not
how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread