What is a decat exhaust

thexav

Pro Tuner
Staff member
Points
387
Car
2002 Clio 172
Can you explain what a decat exhaust is, do they give better power and are they legal in the UK?
 

obi_waynne

Administrator
Staff member
Moderator
Points
887
From
Deal, Kent UK
Car
A3 1.4 TFSI 150 COD
It is an exhaust with the Catalyst removed. It improves flow rate but most cars will fail the UK emissions test if you take out the cat.

It could be a long length of exhaust or just a small pipe which replaces the cat.

Some cars have a smaller pre cat and then a larger cat further down in the exhaust.

A sports cat is a good compromise. I know some drivers who have a pipe they bolt in for off road use to replace the cat and then when they need the car to be legal they just bolt the cat back on.
 
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