stiMIGHTYsti

iTrader: (1)

Will changing to to de-cat pipe cause me problems or will map need a tweek?

2005 sti PPP, remapped by Andy Forrest

arthur.d

i would think it would need a check and perhaps a tweak-probably better asking the man who mapped it

bludgod

iTrader: (3)

as above, if it's been mapped then the map will need adjusting to work properly with your new modifications. Time was spent calibrating the ECU to give the best performance with your catted downpipe - now without the cat there is less restriction in the exhaust so wastegate settings, ignition timing and fuel need adjusted again to match.

stiMIGHTYsti

iTrader: (1)

Thanks, gonna leave it till got bigger turbo then map from there.

SLAB

iTrader: (77)

deffo a tweek when you change anything to do with the petrol air flow and exhaust but many dont