So I'm looking through my friends stack of complete twins to replace mine and see these. I think they're 99spec but I could be wrong...I also saw some 20b setups...

So my questions are:
Are these 99 spec twins?
Can you modify the stock twin manifold with 20b turbos?

 

99-spec? Can't tell.

I read somewhere in Yamaguchi's book that the 20B turbos flow LESS than the 13B's. I don't know if it's true or not, but even if they flow equally, why not save yourself the trouble of retrofitting them and use 13B turbos?

 

20b turbos flow less

they probably do not mount up either considering they manifold is for 3 housings

 

Ok well I was just wondering since the turbos themselves are larger. I was going to bolt them to the 13b exhaust housing.

Anyone know if those are 99 spec? I've never seen them before...Completely different than stock twins. I don't think they're aftermarket...

 

Look at the part number on the rear compressor housing. If it starts with "N3G1", they're RZ turbos. There are a couple other configurations used 99-02 with other part numbers, but they're not the "280bhp" turbos.

Looking at your photo, I don't see the abradeable seal in the compressor housing, so they're not RZ turbos.

 

 

20B turbos are a waste of time... throw the 99' specs out with it.

If you really want to go/stay twin... BNR Stage 3 is the only way to go.

 

Well just a thought anyway. I will just be using the twins for about another year anyway before I simplify the engine bay with a single setup.

 

I think those twins are either 20b twins or 13B Cosmo twins - both of which are smaller than the FD twins and not worth any effort.

Dale