DB9 2007 Cat Bypass - Options

[Stephen-xvwu1]

Pulled fuse 22 .... but still looking for more noise (had a TVR and 911 with sports exhaust previously).

I've been looking at secondary cat bypass options.

Questions:

- does it trigger any engine warning lights?
- are there lambda sensors?
- what's the difference between straight pipes and x-pipe versions?

Thanks in advance.

Edited by Stephen-xvwu1 on Thursday 3rd September 19:40

[GT Two]

Stephen-xvwu1 said:

pulled fuse 22 .... But still looking for more.

I've been looking at secondary cat bypass options.

Questions:

- does it through any engine warning lights?
- are there lamba sesnors?
- what's the difference between straight pipes and x Pipe versions?

Thanks in advance.

I have this from David Appleby engineering on a V12V but I understand its the same process. Mine was a straight pipe and sounds wonderful.

No warning lights.

It was fitted while I waited.

http://www.davidapplebyengineering.com/rsfv12.html

[Ken Figenus]

Having mine done shortly.... Just 2 short pipes any half tidy custom exhaust outfit can do...for a lot lot less than £600!

[Stephen-xvwu1]

Ken Figenus said:

Having mine done shortly.... Just 2 short pipes any half tidy custom exhaust outfit can do...for a lot lot less than £600!

Thanks, yes I am intending to use longlife in Bristol - I've used them a numerous times for Range Rovers .... been quoted £280 ish

[shuzzy]

I've currently got 2 Quicksilver secondary cat bypass pipes in my boot waiting to go on to my 2007 DB9. Suffice to say looking forward to what the results will be. The pipes retail for just under £700, but they were a fraction of that from a popular auction website. However as said any competent exhaust fabricator should be able to knock some up for a few hundred quid. Will let you know what its like when they are fitted.

[GT Two]

I had a cheap secondary decat done on a C63 and I felt the car had lost torque.

Had the the car checked and the welds were terrible and so large on the inside it was interfering with flow. You buy a lovely expensive Aston Martin, why compromise?

Im sure your welding guy will have the skills but make sure its a neat solution.

[Ken Figenus]

The recommended good indie guys live or die by this stuff but will be sure to post internal weld shots as you are bang on the money (bought an EcoTune downpipe once for a BM - very knobbly welds inside...).

[07sportspack]

I have a Fabspeed "X" pipe on my 07 DB9. An easy install and much better note than just fuse 22 pulled. Eventually I added a Quicksilver Super Sport rear box. To me that combination has produced a really defining Aston exhaust note. http://www.pistonheads.com/gassing/imgs/9.gif The cars exhaust note always receives complements. When this DB9 starts up the image and personality some have of the more docile DB9 is erased! NO codes at all.

[Ken Figenus]

Now I thought that was a link to something with SOUND!

[GT Two]

My V12V, click for sound!

[Ken Figenus]

[Stephen-xvwu1]

Thanks everyone ....

Any views on straight pipes v x-pipe format?

[8Tech]

Considering the layout of the heatshields above that section, I think straight pipes would not only be easier to fabricate, but would follow the shielding better, and as an X pipe would rigidly join the 2 sides of the exhaust with little or no benefit, then installation and manufacture would be far more difficult.

Whilst "bobbly" welds may not be attractive, I doubt that they will hinder flow as much as the original cats. With the major restriction still in the exhaust manifolds, I would not worry too much about them unless I had a tuned manifold and then used hi flow cats.

The flow is only as good as its worst flowing components, and those are the cats in the manifolds.

[Stephen-xvwu1]

Thanks everyone ....

Any views on straight pipes v x-pipe format?

[Dan1heMan]

Had my DB9's secondary cat's removed with Quicksilver de-cat pipes and also have a Quicksilver sports back box, makes a lovely noise.

From what most people say in a certain supercar club, its a lot louder and raw than a DBS.

https://www.youtube.com/watch?v=GPYT7aT9qak

[GT Two]

Dan1heMan said:

Had my DB9's secondary cat's removed with Quicksilver de-cat pipes and also have a Quicksilver sports back box, makes a lovely noise.

From what most people say in a certain supercar club, its a lot louder and raw than a DBS.

https://www.youtube.com/watch?v=GPYT7aT9qak

Any static vids Dan? sounds good!!!

[Dan1heMan]

This is the only vid I know of when I was on a Jan meet last year.

https://www.youtube.com/watch?v=wsgGjFk-3UQ

[GT Two]

Dan1heMan said:

This is the only vid I know of when I was on a Jan meet last year.

https://www.youtube.com/watch?v=wsgGjFk-3UQ

Thanks, still sounds like an Aston should do.

Was it the Sports or Supersports Quicksilver?

[Dan1heMan]

Just the standard sports exhaust. In 6th gear doing 70ish, its rather quiet and not droning at all too.

With it being a manual and has the sportspack, its a great joy to drive.

[shuzzy]

So I have had my decat pipes fitted and am very happy with the results. For the relatively modest cost it makes a noticeable difference. I wasn't expecting them to make a huge difference, but I am happy to be wrong. Its louder when revving whilst stationary and quite a bit louder when actually driving on the road. The only problem with it is, it makes me want to 'press on' all the time!