EPA-Compliant 400-Cell Catted Downpipes for Porsche 992 GT3 / GT3 RS

Overview

Improve high-RPM breathing on the Porsche 992 GT3 and GT3 RS with Valvetronic Designs EPA-compliant catted downpipes. Developed for the 4.0L naturally aspirated flat-six, the high-flow design reduces restriction while supporting the car’s motorsport-derived character and emissions-conscious requirements.

Sound

The freer-flowing downpipes deliver a sharper, clearer exhaust note with stronger presence as engine speed rises. The result is enhanced high-RPM character without turning the naturally aspirated flat-six into an uncontrolled or overly harsh system.

Construction

Built around high-flow 400-cell catalytic converters and precision-fabricated stainless-steel tubing. Smooth transitions and carefully engineered connections support improved exhaust velocity, durability, and a direct-fit installation.

Fitment

• Porsche 992 GT3

• Porsche 992 GT3 RS

• 4.0L naturally aspirated flat-six

• EPA-compliant 400-cell catted downpipe configuration

Features

• High-flow 400-cell catalytic converters

• Reduced exhaust backpressure

• Improved high-RPM breathing

• Sharper, more defined exhaust character

• Direct-fit, emissions-conscious design