To me, it doesn't seem a Gen 5 link pipe and neither a Gen 4. Gen 5 doesn't have the O2 bung and Gen 4 has a different style one. In Gen 5 you need two clamps and a spring, and on Gen 4 there are no springs. You have one clamp and a spring (I can't see if there is the akrapovic logo on it, and also the clamp looks different from the akrapovic), but normally the spring should be included with the slip-on with the other clamp, not with the link pipe.