This is the RB Concept EFRA 2045 Matte In-Line Tuned Pipe. This is the one piece variety and requires an off-road manifold, which attaches to the tuned pipe using three small springs and a manifold gasket which are included. This pipe is designed for mid range performance, but has excellent bottom end and excellent top end.
This is only the tuned pipe, and does not include a manifold which must be purchased separately. This pipe is made available as a separate item so you can choose either the long or short manifold, depending on whether you want better top or bottom end performance.