Originally Posted by b15

Yes. They utilize a horizontal muffler set up so you won't see much of a difference. In terms of sound, there's definitely more of it but still muffled compared to Fast Intentions, Ark, Motordyne. The tones they emit all sound much better IMO.

If you don't like the muffler 'can' design of the above, look into Berk as well. It'll retain more of the stock look but gives more growl than Stillen. Pair it with some Berk test pipes and that's how the Z should've come stock!