Remark Y-Pipe KitY Pipe Kit for the Nissan Z RZ34 (2023+) Dual 2. 5" to 3. 0" Y Pipe bolts directly to the downpipes. Combine with midpipe kit, and axleback kit for a complete catback exhaust system. Reduce exhaust backpressure to improve performance by allowing the exhaust system to flow more freely. Y pipe includes flex couplers on each leg to reduce stress on the merge collector for long lasting usage. NOTE: The Y Pipe does NOT eliminate the catalytic converters