This is the RB Concept EFRA 2045 polished inline tuned pipe (no manifold). 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 (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.