Db9 exhaust manifold removal

[MarkwG]

NMNeil said:

MarkwG said:

That's not what the link you posted says - " it is an offence to use on a road a vehicle which has been modified in such a way that it no longer complies with the air pollutant emissions standards it was designed to meet."

So it's illegal to modify a car such that it no longer complies with the emissions it was originally certified with; it does not say you cannot modify at all.

As written, true. But if the car originally had type approval by meeting all the emissions requirements without those cats, why did they go to the considerable expense of fitting them in the first place?
I'm sure if the OP removed the cats then had the car inspected to make sure it still only emitted a maximum of 0.3% CO at idle, 0.2% CO and a max of 200 PPM HC at fast idle it should be fine.

That wasn't the original question you asked, however as others have pointed out, because it's often cheaper to build every car to meet the most onerous requirements, than try to custom fit for every market, particularly for a small volume manufacturer such as Aston.