Valved exhaust system FMIC.Pro for Porsche 911 GT3 991 3.8L 4.0L 2014-2019

The FMIC.Pro exhaust system is designed to improve exhaust gas flow and deliver a noticeably sportier sound character.

The 70mm / 2.75” piping diameter combined with the muffler configuration provides a deeper, fuller tone under load while maintaining driving comfort during normal operation – especially with the valves closed.

The system is manufactured entirely from SS304 stainless steel, resistant to corrosion and high operating temperatures. CNC mandrel-bent piping ensures consistent geometry and precise fitment to factory mounting points. Installation is straightforward and follows a plug & play concept. All welds are performed using TIG welding in an argon atmosphere, ensuring clean, aesthetic, and fully sealed joints – essential for long-term durability.

CNC-machined 10 mm thick flanges are used at connection points. They provide high rigidity, reduce the risk of deformation caused by thermal cycles, and ensure even gasket pressure across the entire surface.

The system features integrated electronic exhaust valves that control exhaust gas routing in the rear section:

Closed mode - exhaust gases pass through the full silencing section, delivering a refined sound and high comfort for daily driving.

Open mode - exhaust gases bypass the rear muffler, resulting in a louder, more direct, and sportier exhaust tone.

This solution allows the driver to adjust exhaust characteristics depending on driving conditions and preferences. Valve control is operated via the included control module and two remote fobs, allowing instant switching between modes.

This performance version replaces the factory side mufflers and the central section of the exhaust system while retaining the original headers and catalytic converters. Replacing the factory side mufflers and the central exhaust section significantly reduces sound attenuation and brings out the full, raw character of the high-revving GT3 engine.

The system responds more directly to changes in engine speed, while at high RPM the sound becomes exceptionally intense and distinctive. The mufflers equipped with active valves allow the exhaust character to be adjusted, combining an extreme sound with the option of partially reducing the volume during more relaxed driving.

For maximum performance potential, it is recommended to pair the FMIC.Pro system with a high-flow downpipe (especially for turbocharged engines).

Exhaust tips: 2 round
Pipe diameter: 70mm / 2.75”

Engine: 
-3.8 Boxer MA1.75 475 HP
-4.0 Boxer MA1.76 / MA1.77 500-520 HP

Fitment:
-Porsche 911 GT3 991.1 3.8 Boxer 475 HP 2014-2016
-Porsche 911 GT3 RS 991.1 4.0 Boxer 500 HP 2015-2016

-Porsche 911 GT3 991.2 4.0 Boxer 500 HP 2017-2019
-Porsche 911 GT3 RS 991.2 4.0 Boxer 520 HP 2018-2019


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