I am getting my 03 sti UK mapped soon.
I am just wondering is it worth fitting a harvey up pipe and ported headers before I get it mapped seen as I will be sticking with the standard VF35?
I know there is gains to be had fitting them with a bigger turbo but is it worth my while with the VF35?
All opinions welcome.
Cheers

 

in a word yes, both combined will def help the end result. you will gain earlier spool from an already quick spooling vf35 and should make around 330+