Absolutely LOVE the z1 competition Y back. The material, fit and finish is as good as my Corsa Extreme on my mustang GT. It's MUCH louder than I expected, but in a good way. The tone... sounds exotic. Low rpm rumble akin to an UEL header boxer engine, then revs up to a porsche-ish exotic. Incredible tone throughout the powerband. I have only two complaints, but they're minor. Instructions needed to be downloaded which is no problem, but they were lacking in any detail. I actually had to use the picture of the completed exhaust off Z1 site to put it together. Not at all hard, as this isn't my first exhaust, but directions could have been WAY better. And second complaint isn't a Z1 issue, it's a 370z hatchback issue. The volume of the exhaust at WOT, especially around the 3500 rpm range, is so damn loud in the trunk, it vibrates my subs pretty good. Some sound deadening material might be necessary. Again, not a Z1 product issue, a 370 issue. Absolutely love the exhaust tone and volume. Great product!