Like a few people on here i'm in the middle of a freshen up of the turbo intercooler and fuel systerm on my 98 sti4 i have a walbro,td05/06 20g and hybrid fmic waiting to go on the car,
My question is do i need to change the 440cc injectors as i'm hoping for around the 350bhp mark.

 

IMHO Yes you will need to change them to 550's if you are looking for the 350bhp mark. I have been there, and was advised to by experts.

 

If that's the case then do i need a new FPR to go with the fuel pump?

 

Does anyone know where i can get a set of 550's for a phase 1 rail?