Nissan 370Z Z34 Infiniti G37 Coupe VQ37VHR 3.7L 08-11 Exhaust Test Pipe Pipes | eBay
those tp's (or some similar to that with the o2 extender).
no check engine lights, and after driving a stock z then hopping back in this, this definately feels waaay more responsive and getting those cats out really helps the engine breath better up top