| these two small foam pieces on both sides. More engine noise came through. So I would say if you don't care about your noise level in the cabin, then it doesn't matter if you have insulation under the hood, but you can hear the difference when cruising, even with a full exhaust. 

"Straight-line acceleration is probably the first aspect of automotive performance that any intelligent driver gets bored with." Peter Gregg
"We owe a lot to the dragsters. They always break something, figure out a way to beef up the part and the benefit trickles down." Robo
"Not everything that can be counted counts. Not everything that counts can be counted." Einstein
"And now my friend, the first-a rule of Italian driving, [Franco rips off his rear-view mirror and throws it out of the car] what's-a behind me is not important." Raul Julia, playing Franco Bertollini while driving a Ferrari Daytona in the movie Gumball Rally
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