Alfa Romeo Forum - View Single Post - De-catting

Pud237 · 10-02-2008

Originally Posted by Kanga

Pud in theory correct,but in reality modern cars are very restrictive due to emissions and sound requirements.With pre cats in the manifolds,restrictive ceramic low flow cats(400 cells per square cm )compared to metallic metal hi flow(200 cells per square cm) and restrictive exhausts.An example can be had with the latest Aston Martin Vantage;LARINI make news cats for them and hp increases by 32,a free flowing sport exhaust and a further 26 hp increase.I would say nearly all road cars are restricted because of emission regulations and noise regulations.

This is a vintage 156 V6, so no pre-cats in the manifolds and only one metallic cat.. Centre pipe is unsilenced also.

Anyway, my mind is made up. I am going to de-cat but only after MOT-time

10-02-2008	#19 (Post Link)
Pud237 AO Platinum Member Join Date: Apr 2006 Location: North Yorkshire Posts: 14,687 Member car: Alfa 156	Re: De-catting Originally Posted by Kanga Pud in theory correct,but in reality modern cars are very restrictive due to emissions and sound requirements.With pre cats in the manifolds,restrictive ceramic low flow cats(400 cells per square cm )compared to metallic metal hi flow(200 cells per square cm) and restrictive exhausts.An example can be had with the latest Aston Martin Vantage;LARINI make news cats for them and hp increases by 32,a free flowing sport exhaust and a further 26 hp increase.I would say nearly all road cars are restricted because of emission regulations and noise regulations. This is a vintage 156 V6, so no pre-cats in the manifolds and only one metallic cat.. Centre pipe is unsilenced also. Anyway, my mind is made up. I am going to de-cat but only after MOT-time