can top feeds be used on a gc8 obviously with top feed rails?

 

Not sure if the New Age fuel rails will fit any of the Classics' 3 different phases of inlet manifold - I'm sure someone will be along soon to answer that question...

However, if the car is a v.5/6 MY98-00, then the answer is yes, as the top feeds can fit the Classic phase 2's OEM rails by way of an adapter kit. See here...

Carl Davey, specialist Subaru Impreza parts supply

 

no v 2 unfortunately, not too bothered about rails more about if the injector would fit manifold.unless someone has some 550cc they wanna sell cheap for my side feed rails?!

 

Yeah, that would be the no-hassle option!

See here for the max bhp capability for different injectors...

Scoobypedia | Trusted knowledge for everything Subaru | Knowledge / Estimated Horse Power from Injectors

As can be noted, with the OEM FPR (at 3bar), the 550s are good for around the magic 400bhp mark - but that is at 100% IDC - with suitable turbo/FMIC and other supporting mods permitting.