The cat-back has Greddy outlets and the cat-back fits the 370z and G37, might need a small thing but for (Q50 3.7 it fits directly). - The size is 2.5 inches. - For sale: full cat-back, custom-made by Al-Imtiyaz in Usfan. Greddy mufflers + 370z mid-mufflers installed on the cat-back for smoothing. - The electronic cat-back has valves and resonators. The cat-back is new, I had it made in Ramadan, used the car and the cat-back was installed for less than a month. - The price is negotiable at 2500. - Contact via private message.