Aston Martin DB9 Modified Exhaust, I was going to modify the silencer on the DB9 to produce a better louder sound when the valves are open but not changing the sound in quiet mode, however I came across a better option, using a Vanquish S exhaust backbox instead.
My exhaust is decatted (secondary cats removed) which makes it much louder, but then has an x-pipe which, in my opinion makes it sound better, smoother but quieter.
The Vanquish S exhaust has a number of advantages over the DB9 exhaust
- Much lighter, 13Kg instead of 25Kg
- Quad outlets, which look cool
- Cooler running, because the straight through pipe doesn’t heat up the silence
- Louder in straight through mode
DB9/DBS Silencer system
As can be seen even the straight through pipe has perforations to make it quieter.
Vanquish Silencer System
The Vanquish (Mk2 from 2013 – 2018) has a different system, more like the Vantage V12S system with a smaller box and with the straight pipes external to the silencer box, inside the box is a crossover system, like an H- Pipe. The Vanquish S also has an additional 2 outlets.
I managed to find a Vanquish S box very cheap and originally I was going to remove the additional outlets, but after a poll on Aston Martin DIY on facebook the overwhelming response was go for quad outlets, photoshopped below to see what it would look like.
Aston Martin DB9 Modified Exhaust Installation
Trial fitted the Vanquish S rear box, the box is much smaller but the extra outlets touch the Battery back up sounder and are very close to the vacuum pump.
I have found that the boot gets very hot on long trips, not great for picnics 😉 There is just a single heat shield between the silencer and the boot floor.
I added extra heat insulation (partly done above), this combined with the fact the the louder pipes are now straight through, not heating up the rear exhaust box will keep the champagne in the boot much cooler.
This is where the vacuum pump mounts (battery backup sounder is almost identical), it was touching the outer outlet pipe of the exhaust.
An extra bracket fabricated to move the vacuum pump, reservoir and solenoid away from the exhaust.
The scary part, starting to cut the diffuser out for the extra outlets.
On the DBS the exhaust tip is mounted onto the rear exhaust mount, I purchased extra rear mounts to fit the extra outlets, the sides of the floor are slightly lower so the mount had to be modified to get the exhaust tips to be more level.
Aston Martin DB9 Modified Exhaust Youtube Sound Clips
These do not do justice to the sound of the exhaust, it is much louder in loud mode (I have a 3 way exhaust switch), but still nice and quiet in the quieter mode.
Great post. Did you have any more photos of the inside of the standard DB9 backbox?
Interesting even the ‘straight’ pipe has perforations
Posted some mor pics in your post on Pistonheads