what is a decat?

Soldato
Joined
27 Aug 2004
Posts
2,955
Location
Singapore ExPat
n00b question but what are the advantages/disadvantages of having a decat? I have an sti exhaust on my 02 wrx and would like to make it slightly quicker. I've been advised a new filter and a decat? Is that the way to go for a few extra hp? Cheers
 
is it an easy swap? low down is exactly where i need the extra grunt...What about the filter? worthwhile?
 
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