One of the reasons for the 305 HP V10 rather than the 362 HP in the E series is heat especially around the firewall area. Might want to consider how adding a 1/2 to 3/4 inch piece of insulation to the inside of the doghouse may impact air flow around the engine.
If the issue is sound you might want to consider a thinner sound deadening material rather than a insulating material.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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