In the meantime, I picked up an engine cover that supposedly has "sound insulation" on the back (looks like Jute with a foil heat shield).
I'm still skeptical if there will be any benefit at all, but having recently had my car serviced and they temporarily screwed something up, I did notice high frequency noise (which was why I went back and they fixed it) from the top of the motor - and figured worst case it dresses up the engine bay.
I picked up some side trim too that Type R Civic came with.
If nothing else, it looks better.
The Civic comes with SOME under hood insulation, but I can always add to that or totally replace that down the road, also.
Really though - I think it's the firewall that I'll want to address, eventually. I don't care so much about engine noise outside the car - it's "in the cabin" that matters to me.
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