Hi terry,
If a panel filter - I would say negligible increase.
Induction would give more but maybe require a map - not sure if that’s possible on the new new STI’s???
Sure Scott looked into tuning the new ones?
__________________
Subaru Impreza WRX STi Prodrive Type UK 2002: 
"Tinkered With!" 
Maintained and Modified by Super Jules 
&
RM Performance http://www.rmperformance.co.uk
|