AMS Performance Street Lower Downpipes - Nissan Z (2023+)

Designed for enthusiasts who demand peak performance and reliability, the AMS Performance VR30DDTT Street Lower Downpipes deliver enhanced exhaust flow, quicker turbo spool, and emissions compliance. Crafted with full 3" mandrel-bent stainless steel tubing and featuring EPA-compliant ultra high output GESI catalytic converters, these downpipes offer a perfect balance of power, durability, and emissions control. Capable of supporting up to 850hp per converter, this system ensures a superior driving experience while maintaining street legality.

Key Features:
• EPA-compliant ultra high output GESI catalytic converters rated to 850hp each
• Full 3" mandrel-bent stainless steel tubing for maximum exhaust flow
• Precision CAD-designed brackets for secure, OEM-like fitment
• 2.5" to 3.0" adapter included – compatible with stock, 2.5", and 3" exhausts
• Subdued exhaust note – ideal for taming aggressive cat-back exhausts
• Includes all necessary gaskets (rated to over 800°C) and hardware for installation

First-Class Engineering and Fitment:
At AMS Performance, engineering comes first. Developed using 3D scanning and Solidworks® CAD software, the VR30DDTT Street Lower Downpipes were designed for perfect OEM-like fitment and maximum durability. 3D-printed prototypes allowed for test-fitting and rapid refinement, ensuring flawless mounting geometry. Robust integrated mounting brackets reduce flex and prevent cracking — an issue often seen in cheaper alternatives. This commitment to precision engineering guarantees lasting performance under demanding conditions.

GESI Ultra High Output Catalytic Converters:
Each downpipe is equipped with GESI’s latest G-Sport Advanced Series catalytic converters, featuring a durable 304 stainless steel shell, 300 CPSI high-flow substrate, and a proprietary precious metal washcoat. Double-Lock technology ensures substrate stability, even under extreme temperatures up to 1500°F. These converters deliver exceptional emissions control without compromising performance, making them ideal for high-output, forced induction applications.

Benefits:
• Reduces backpressure for improved turbo spool and throttle response
• Maintains emissions compliance with EPA standards
• Supports big power builds up to 850hp per converter
• Provides a more civilised exhaust note while improving flow
• Long-term durability with premium stainless steel construction