Noisy question....
Discussion
Hello esteemed noise experts,
I'm after some subjective and objective thought on exhaust systems.
Fuse 22 switch / removal seems a little lame.
Noting cost as well, what are your opinions on:
- De-cat tubes with std rear box
- Aftermarket rear box (Quicksilver Sports)
- Other aftermarket rear box
Whilst I know there isn't a proper performance gain, reduced weight seems to be a benefit.
I had a Cargraphic rear box on my 911 and the sound alone 'egged you on' making it seem faster!
I'm quite keen not to have a droning sound at motorway speeds.
Thoughts.
Sean
I'm after some subjective and objective thought on exhaust systems.
Fuse 22 switch / removal seems a little lame.
Noting cost as well, what are your opinions on:
- De-cat tubes with std rear box
- Aftermarket rear box (Quicksilver Sports)
- Other aftermarket rear box
Whilst I know there isn't a proper performance gain, reduced weight seems to be a benefit.
I had a Cargraphic rear box on my 911 and the sound alone 'egged you on' making it seem faster!
I'm quite keen not to have a droning sound at motorway speeds.
Thoughts.
Sean
4.3 or 4.7 ?
The 4.7 is noticeably quieter as standard. I was always happy with my 4.3 with fuse removed, then when I got a 4.7 and did the same, hardly noticed. The 2nd set of cats quiet it down a bit too much, the exhaust tips a little too.
I went with the easy/cheapest option first; Larini replacement pipes for secondary cats for £400 ish. With the fuse out, it now sounds as it should have from the start. No need for anything else, im not chasing power numbers.
If you find a fuse out 4.3 lacking a few dB you will get the same effect by fitting some 200 cell sports cats....
The 4.7 is noticeably quieter as standard. I was always happy with my 4.3 with fuse removed, then when I got a 4.7 and did the same, hardly noticed. The 2nd set of cats quiet it down a bit too much, the exhaust tips a little too.
I went with the easy/cheapest option first; Larini replacement pipes for secondary cats for £400 ish. With the fuse out, it now sounds as it should have from the start. No need for anything else, im not chasing power numbers.
If you find a fuse out 4.3 lacking a few dB you will get the same effect by fitting some 200 cell sports cats....
Car mad enthusiast said:
A full QS system like what I have will do the trick along with a pair of sports cats. ![](http://thumbsnap.com/sc/TVv3mUFq.jpg[/img]</a> <a href="http://thumbsnap.com/lwzEGI6Z" Target="_blank" rel="nofollow">[img]http://thumbsnap.com/sc/lwzEGI6Z.jpg[/img]</a> <a href="http://thumbsnap.com/lwzEGI6Z" Target="_blank" rel="nofollow">[img]http://thumbsnap.com/sc/lwzEGI6Z.jpg)
Unfortunately what you state won't do the trick and is only relevant to DB7.Edited by Car mad enthusiast on Monday 6th March 18:56
Edited by Car mad enthusiast on Monday 6th March 18:57
Edited by Car mad enthusiast on Monday 6th March 18:59
DB7 fruitier exhaust note comes from firstly changing the centre section baffle box, whereas DB9 has no intermediate baffle meaning unlike DB7, on DB9 there is no point whatsoever to change the intermediate section. The next step on DB7 could be a different silencer and perhaps cats, but just by removing intermediate baffles normally hits the spot.
For DB9, the first step noise increase is simple fuse 22 removal, then a secondary cat delete, the next could be replacement silencer, the last and most intrusive step could be a manifold upgrade and high flow secondary cats but that is done primarily for power and the noise improvement is secondary / byproduct.
However, anything that is done upstream of the remaining factory silencer will always play the same DB9 type tune, just a bit louder. Compared to DBS, the DB9 silencer / exhaust note is not as fierce, crisp or crackly, and the original wallowing sounding factory DB9 silencer is always the constraint - it will never play a crisp tune. So I would consider std DBS or DBS with secondary cat delete as the perfect sweet spot exhaust note to aspire to.
My advice would be to buy a factory DBS silencer which retains functionality of bypass valve so a quiet and loud mode is possible. The benefit of the factory silencer is that it has all harsh pressure waves / buffeting / drone type sounds engineered out, whereas in my experience most aftermarket silencers lose functionality of valves (no quiet mode) and have poor noise / vibration and harshness (lack of) qualities. Then, if you wanted a touch louder exhaust note, do the secondary cat delete.
Before spending a penny, listen to a std or cat delete DBS to see if that is the noise you are after - plenty of those around.
I'm sure my comments warning against aftermarket silencer will attract comments to the counter, but simply put, I have never experienced an aftermarket silencer which scores perfectly when being critically scrutinised against the same standards of noise / vibration / harshness which the factory silencer undergoes - hence why DBS silencer for DB9 is the winner over aftermarket - no question!
However, anything that is done upstream of the remaining factory silencer will always play the same DB9 type tune, just a bit louder. Compared to DBS, the DB9 silencer / exhaust note is not as fierce, crisp or crackly, and the original wallowing sounding factory DB9 silencer is always the constraint - it will never play a crisp tune. So I would consider std DBS or DBS with secondary cat delete as the perfect sweet spot exhaust note to aspire to.
My advice would be to buy a factory DBS silencer which retains functionality of bypass valve so a quiet and loud mode is possible. The benefit of the factory silencer is that it has all harsh pressure waves / buffeting / drone type sounds engineered out, whereas in my experience most aftermarket silencers lose functionality of valves (no quiet mode) and have poor noise / vibration and harshness (lack of) qualities. Then, if you wanted a touch louder exhaust note, do the secondary cat delete.
Before spending a penny, listen to a std or cat delete DBS to see if that is the noise you are after - plenty of those around.
I'm sure my comments warning against aftermarket silencer will attract comments to the counter, but simply put, I have never experienced an aftermarket silencer which scores perfectly when being critically scrutinised against the same standards of noise / vibration / harshness which the factory silencer undergoes - hence why DBS silencer for DB9 is the winner over aftermarket - no question!
My response to the OP's question was in general only as he had NOT eluded which model he had and wanted to mod.
My reply is mearly of what I have done with a QS system of which I am really happy with the sound and outcome and it certainly does the " Trick " for me anyway.
My reply is mearly of what I have done with a QS system of which I am really happy with the sound and outcome and it certainly does the " Trick " for me anyway.
BamfordMike said:
Unfortunately what you state won't do the trick and is only relevant to DB7.
DB7 fruitier exhaust note comes from firstly changing the centre section baffle box, whereas DB9 has no intermediate baffle meaning unlike DB7, on DB9 there is no point whatsoever to change the intermediate section. The next step on DB7 could be a different silencer and perhaps cats, but just by removing intermediate baffles normally hits the spot.
DB7 fruitier exhaust note comes from firstly changing the centre section baffle box, whereas DB9 has no intermediate baffle meaning unlike DB7, on DB9 there is no point whatsoever to change the intermediate section. The next step on DB7 could be a different silencer and perhaps cats, but just by removing intermediate baffles normally hits the spot.
Guys,
Sorry for my tardy reply and many thanks for the replies.
2005 DB9, so I think only one set of cats? I didn't think the early V12 had primary cats.
Mike it sounds like I need to listen to a DBS.
Depending on price a high flow cat might be an option as this may be cheaper than DBS back box. £500-£600 vs. £2000 (that's assuming I can find a DBS back box).
Sean
Sorry for my tardy reply and many thanks for the replies.
2005 DB9, so I think only one set of cats? I didn't think the early V12 had primary cats.
Mike it sounds like I need to listen to a DBS.
Depending on price a high flow cat might be an option as this may be cheaper than DBS back box. £500-£600 vs. £2000 (that's assuming I can find a DBS back box).
Sean
I have a Quicksilver on my DB9 and a Larinni on my Vanquish S. Have to say I prefer the Larinni by a way, but that could be down to differance in cars. Having had both as standard I think the noise from the Larini is better, QS is louder for sure but less "meaty". If you ever around Hampshire and want to hear both let me know!
Gassing Station | Aston Martin | Top of Page | What's New | My Stuff