Tuned Exhaust

General Aviation faces increasing problems tied to noise issues.

Our experience at the highest level of motorsports naturally led us toward designing and manufacturing a complete range of innovative muffled exhausts for light aircraft.  They meet environmental requirements, while enhancing performance, and are certified by the EASA (European-Aviation-Safety-Agency).

Noise level reduction

Depending on frequencies, our designs reduce noise levels from 3 à 10db(a) and improve the quality of the sound, making it rounder and thus more agreeable.

Reduction in engine

A 50% reduction in vibrations reduces wear and tear on the airframe and instruments while enhancing the cockpit environment.

Fuel burn reduction
Compared to aircraft equipped with their original exhausts, ours reduce fuel consumption by a 10%.

Torque increase
On average, 50 meters shorter takeoff distances: a non-negligible benefit under hot and high condition

The complete kit contains

4 in 1 Assembly

Four primary tubes of precisely identical length meet in a 4 in 1 exhaust to equalize exhaust gas dissemination; they are then expelled through a single tube. This is the basis of a tuned exhaust. The length of the primary tubes is determined by each power plant’s characteristics (throw, bore, valve sequences) and of space available inside engine cowlings.  This system permits all cylinders to deliver the same power.

A Muffled Exhaust

The muffled exhaust operates the principles of diffraction and absorption.  An expansion chamber of galvanized perforated steel ensures diffraction. Soundproofing material around the expansion chamber ensures absorption.  Neither of these functions diminishes power output. The life of the muffled exhaust is 600 hours (300 hours for Jodel Mousquetaires operating in a mountain environment). At those time limits, the exhaust must be returned to us for complete disassembly, inspection and interior renovation; new acoustic insulation is also installed.

Swivel Joints

When lack of space inside the engine cowling demands it, the muffler is mounted beneath the aircraft’s fuselage. In those cases, swivel joints are installed between exhaust assemblies and mufflers.  These dampen mechanical wear and enhance the reliability of the entire system.

Included parts

Clamps, screws, and flexible ducting for carburetor heat and cabin heating are included to provide rapid and easy installation of the entire system.

Installation Manual

The manual allows you to install the system in-house. It includes all the necessary photographs for a clear overall; view of the system, a complete and numbered index of all parts and pieces, clearly indicating materials and the number of parts, as well as a step by step installation guide.  The manual’s content was reviewed and approved by the DGAC (French version of the American FAA, British CAA, Swiss OFAC).

Materials used
The primary tubes, collectors and mufflers are manufactured from Inconel 625 This extremely strong and NASA and makes used heat-resistant material for a highly reliable assembly. The gaskets and clamps are made of Inox 316L.
Structural parts are made of 15CDV6T steel, widely used in aviation and, in our case, for all mecano-welded parts. The parts are surface-treated against corrosion.

Certification, Regulations and State-subsidy

Our aviation workshop is certified PART 21, chapter F. New and repaired mufflers are provided with an EASA FORM ONE valid throughout Europe. The DGAC proposes subsidies to defray purchase costs: visit the DGAC web site