This reference is a new way of designing an exhaust.
Indeed the original part has 2 entrances on each side, the small one which is the only one with closed valves. With a diameter of only 38mm it arrives in the silencer by a tube ... blocked! To progress the gases must pass through a perforated sheet. The valves therefore serve both to generate sound but above all to provide additional gas extraction capacity. Beyond a certain engine speed (5000T stopped), the valves open. It is therefore important to keep the original PSE switch.
Making a valve exhaust made up of tubes, without muffler, is counter-intuitive. But with this difference in diameter, it works very well.
This valves exhaust don't fit on a non PSE 991-2
Here are the sound results in decibels:
PSE original closed valves
At rest 71dB
Flat 4000 RPM 90dB
Acceleration 91dB
PSE origine opened valves
At rest 72dB
Flat 4000 RPM 92dB
Acceleration 95dB
SCART closed valves
At rest 72dB
Flat 4000 RPM 92dB
Acceleration 95dB
SCART opened valves
At rest 74dB
Flat 4000 RPM 94dB
Acceleration 98dB
Pour info voici les performances sonore de l'échappement à valves
avec les nos catalyseurs sport 200cc :
SCART closed valves + Sport Cat 200cc
At rest 73dB
Flat 4000 RPM 95dB
Acceleration 100dB
SCART opened valves + Sport Cat 200cc
At rest 78dB
Flat 4000 RPM 96dB
Acceleration 104dB
Scart Weight: 4.90 Kg
Gain Vs Original: 5.66 Kg
reviews
SPO, le 28/03/2023
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