Here you see the intake on a lowport SR20DE found in an almera GTi
And here you can see the intake on a Highport SR20DE.
As you can see the lowport and highport are quite different. The fuel rails are different. The runners on the intake manifold are much longer than the lowport. The injectors are the same. standrad 259cc SR20 side feed injectors. As shown here:
Here are the two fuel rails side by side and you can see the differences.
Lowport here:
and highport here:
Now both these fuel rails are capable of taking ANY SR20 SIDE FEED INJECTOR. Regardless of the differences in the rails.
NOW onto the GA16 stuff.
Here is a UKDM GA16 fuel rail found on N15 nissan almeras
These can only carry the UKDM 159cc injectors.
BUT this fuel rail here :
is from a B13 SENTRA (91-94) in the USA and although it is also from a GA16 it is different to the UKDM fuel rail.... This fuel rail is capable of taking ANY SR20 side feed injectors aswell as standard GA16 american injectors. BUT will NOT fit UKDM injectors due to the sizes as you can quite clearly see.
UKDM GA16 injector (i do not have any USDM injectors so cant get a picture)
And here is the SR20DE side by side with the UK GA16 injector.
Here we can see all Fuel rails along side each other:
The top one is a highport side feed SR20. 259cc standard.
The next one down is the lowport side feed SR20. 259cc standard.
Next one down is the UKDM GA16DE. 159cc standard
Next one is the USDM GA16DE from a B13 Sentra (unsure on cc, althoguh it may be 185cc) and is capable of taking ANY sr20 side feed injector so is a good upgrade on UK and US GA's and they also come with better intake manifolds in the US and will show noticeable gains on the UK GA's.