Difference between STi and STi RA manifold?

[Ryan]

I have my standard STi V2 exhaust manifold here that I'm probably guna put back on my WRX (currently have semi-tuned), just wondering if the STi, STi RA, STi Tyre R etc etc manifolds are all the same?

[funkytown]

the wrx ones are the same too.

the RA in v2 did have allocation for the 5th injector - cant remember if or how this makes it different - i never understood why they had em

[gotasuby]

the exhaust manifolds flow more according to mrt on the RA's

[Ryan]

 funkytown']

the wrx ones are the same too.

the RA in v2 did have allocation for the 5th injector - cant remember if or how this makes it different - i never understood why they had em

Are you refering to the intake manifold funky?

[quote name='gotasuby said:

the exhaust manifolds flow more according to mrt on the RA's

Any idea where I can find out more about this?

[BC5RA]

 gotasuby said:

the exhaust manifolds flow more according to mrt on the RA's

The Australian domestic market delivered Libertys has a market specific exhaust manifold, i can only think that this must be so with the AUSDM WRX etc. I believe this is also true of USDM manifold's.

Being that RA's were JDM only they were fitted with a JDM manifold; here are the differences,

AUSDM exhaust manifold.

JDM exhaust manifold.

You can plainly see the differences. The former manifold collecting just after the port exit and into one pipe.