If you have the rear muffler then go full GTHaus, the sound is divine I think forum member Gauge is still smiling after buying my full catback. HFC's are good, you will have some rasp and hiss and it will be a little louder but you should be able to drive it civilly, I was able to with long tube headers and GTHaus. Get rid of stock cats asap they are too restrictive.
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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling
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