Mine has no cat on it and i have also had the pre-cat cut out of the manifold sounds nice i will get video of it for you. but before i had the pre-cat cut out it was just decated in the middle and the car used to drive like sh*t until i got it remaped. It was jumping and also had a BIG flat spot but now it runs so nice thanks to jms tuning im going back there so that they can change the map so i have a few pops and bangs they are also going to try an overrun map wich when you get up to hi revs and come off the gas there will be a pop and a lil flame shooting out both exhaust tips lol niiiiiiiice