Hi all .. I changin my turbo on my sti..

been lookin for a while now .. and i goin for either a RCM 400/420 or md 555 ..

i guess these units are the same...

i do have some options on these units

1 cermamic coating
2 ported shroud/

what the gains or dif between this ported or non ported

Cheers

 

Does it need a ported shroud?

 

I not sure, I Just been informed that a ported shroud..
reduces surge, but not going to be a prob on a 2.0 l