[aki]

Greddy SE or WS2. WS2 does not sound anywhere near stock. Has a growl to it from low RPMs to 4k. Then the engine drowns out the sound.

 

[aki]

Greddy Evo2 is neither quiet nor low key...

 

[aki]

Sounds like a good plan now that i think about it. Not wanting to get flamed but most aftermarket exhausts for hondas (and other cars for that matter) sound like ****. Just my .02

Well I agree with this, but there are a couple options that sound nicer than stock.

HFP
Greddy SP2
Greddy SE
Apex'i WS2
LSD (coupe)
SRS (lol ebay but it sounds nice)

Aside from the above, aftermarket exhausts sound like weed-whackers at higher RPMs, and that even includes ones like Mugen.