First of all, if you plan on keeping the stock cats then you will have more choices suit your needs. Anything with HFCs or TPs will become loud and likely to be raspy. So in your case, you better off just keep the stock cats.
Here I list the cbe systems I had or heard in person from the quietest to loudest(everything is paired with stock cats here). Hope it helps.
Stock Exhaust:
Loudness - 3/10
Tone - Lawn mower/Vacuum cleaner.
Look - Dual Vacuum cleaner.
Stock Nismo Exhaust:
Loudness - 4/10
Tone - Not loud. It's deeper than the stock exhaust. Very nice sound at low rpm. But still sounds like Vacuum cleaner at WOT.
Look - Stock exhaust look. Little bit more aggressive due to the bigger exhaust tips.
HKS Hi Power:
Loudness - 5/10
Tone - Not loud at all with the stock cats. Sound deeper then the Nismo. But when you hit the gas, it has this nice sporty growl which Nismo doesn't have. This exhaust has 0 drone 0 rasp 0 rattle with stock cats. I will recommend it.
Look - Nice V shaped canisters look mean yet still get you a lot ground clearance. I personally love the blue burnt titanium adjustable exhaust tips. But others might think it's rice. So it's not for everyone.
Invidia Gemini Exhaust:
Loudness - 5/10
Tone - Not a loud exhaust system as well. But it's deep and has this very nice VQ sound when opens up. No drone. No rasp. No rattle. This is one of the best bang for the buck exhaust IMHO.
Look - Looks very nice overall. But the exhaust tips stick out little bit. Will look perfect if you add a rear defuser. Again, I love the blue burnt tips. But it also comes with the stainless steel tips option.
Motordyne E370:
Loudness - 5/10
Tone - Beautiful! Sound very similar to the Invidia Gemini. Deep when cruise. Nice VQ growl when opens up. No drone, no rasp, no rattle.
Look - Perfect fit. V shaped canisters/resonators looks aggressive. Also comes with the blue burnt tips or stainless steele tips options.
Fast Intentions Carbon Fiber Exhaust
Loudness - 6/10
Tone - Deep, deep and deep! Deepest of all. It's one of the most popular exhaust system on this forum. Sound truely amazing. Very mellow sound. It's little bit louder than the exhaust systems listed above. 0 rasp. I don't feel the rattle when I sit in my buddy's car. But according to him, there is little drone around 2 - 2.33818300 rpm. LOL.
Look - V-shaped canisters hanging low and mean. Stainless steele tips look classic. One of the best looking exhaust IMO.
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09 PW 370z Nismo | K&N Drop Ins | HKS Hi Power | Berk HFCs | Work Meister S1 3P | Project Kics R40 Neo Chrome Lug Nuts | KW V1 | SPC rear camber arms/toe bolts | Southbend Stage 3 daily clutch | Southband 19Ib Steel Flywheel | ZSpeed CSC
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