Alright so I currently have G3 intakes and Invidia test pipes and I think my Z sounds pretty much perfect. Love the rasp between 2500 and 3000rpm. I put a full Borla on my old car (Tiburon GT) and it really didn't increase the sound much at all besides the annoying drone at low rpms. Also I just a had a buddy of mine put a full Invidia exhaust on his 2012 STi last week and again..almost no increase in sound at all. My car is still much much louder than his and I'm using my stock exhaust.
Most aftermarket exhaust systems I've seen for the Z are either one of two designs. They have what I like to call the "straight through" design where the two pipes don't intersect at all and the mufflers almost hang to the ground (which I personally hate looks-wise) i.e: GReddy Turbo TI-C, Fast Intentions TDX, HKS Hi Power, or they have the "sinlge/stacked muffler" design where the system pretty much replicates the design of the stock system except for maybe slightly larger piping and the 304 SS construction i.e: Stillen, Nismo, Borla, Invidia Gemini ect. If I had to guess I'd say that the "straight through" systems are louder and add more power being that they have smaller mufflers and have a more true dual design without all those bends in the pipes down by the muffler..but I would never want my mufflers to hang that low. And after watching and re-watching that Stillen video of the stock vs. Stillen..for no more difference in the sound I'd just as soon leave on my stock exhaust and forget about any aftermarket system altogether.
My question is: does anyone know if there is any exhaust out there that actually increases sound by a lot that doesn't have its mufflers hanging to the ground and still has a decent hp increase?
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