I want to fit the parallel fuel rail conversion on my STI RA engine when I get the manifold off but have just realised I have the 5th injector ontop of the manifold.

Can I just fit a normal parallel fuel rail kit or do I have to get one for the STI RA or is it easier not to bother ??

 

The RA 5th injector was only put there for homologation purposes only and doesn't work with the std ECU or Apexi etc you should just leave it off the fuel line and only connect the 4 normal injectors

 

I used an extra T piece an plumbed it in, the thinking behind it was it might need a bit of pressure behind it to seal. Probably not required but it was fine plumbed in, so why change.

 

Could I just use my WRX inlet manifold on the STI RA engine then and forget about the 5th injector or would it be best to keep the RA manifold and plumb the 5th injector in ?

 

No point of plumbing it in, afaik, some RA manifolds have CNC machined ports, the 2 I have here don't though, so if yours isn't then it is the same manifold with an extra hole in.

 

So I could fit the WRX manifold to the RA engine then and just ditch the 5th injector setup ?

My RA manifold has an extra bit where the 5th injector is fitted,the WRX manifold doesn't have that.

 

Yes

it's only there to hold the injector

 

Ok thanks for that