Spool Performance VR30DDTT 4inch “Fat Boi” Full Race Downpipes

Infiniti Q50 / Q60 / Nissan Z (RZ34)

The Spool Performance 4” Fat Boi Race Downpipes are designed to improve exhaust flow while refining sound quality on the VR30DTT platform.

The oversized 4-inch section is engineered specifically to smooth exhaust tone, reducing high-frequency harshness and rasp while maintaining a deep, aggressive character under load. This design allows for a more controlled, intentional sound without sacrificing performance.

Constructed from mandrel-bent 304 stainless steel, these downpipes are fully TIG-welded and utilize CNC-machined mounting brackets to ensure precise fitment and long-term durability. Each set includes all necessary hardware and accommodates both 2.5-inch and 3-inch exhaust outlets.

Features

• 4-inch section for improved exhaust tone

• Mandrel-bent tubing for smooth exhaust flow

• Fully TIG-welded 304 stainless steel construction

• CNC-machined brackets for accurate fitment

• Includes all required installation hardware