Oh its already engineered for a CA??!!
In that case yes go CA18DE with quads and a very good
tip from an ingenious racer is you can go solid lifters
by using Toyota 1zzfe engine factory solid lifters which
supposedly are a straight swap! cheaper than Nismo & others
by 400 bucks or more in some cases.
You should definitely go bigger bores and send your head
to Steve Newing who was able to get 240+hp out of them.

H165 has ring gear diameter of 165mm or 6.5 inches
The Quickchange is 7 inches and in the wiki the
H165 open diff is 52kg. My Alfa lsd with sump and cooling
fins was about 56kg & I think 7.25 inch ring gear with
adjustable torque biasing but a quickchange has the
beauty of the 2 ratios for track and street and nothing
comes close to that beauty.

and yeh does anyone know if there's ca18de itb mainfolds out there? or custom jobby?
also if anyone knows a cheap ca18de for sale lol

yeh well im thinking for now, get a ca n/a, spend a little bit getting extractors, maybe itb's, aftermarket ecu and from there decide on whether or not to go for a better motor/wait for it to blow up haha, ca18de will be easiest
turbo is tempting but i hate the lag etc so i'd look at running an anti lag setup, and it'd be a bit of work haha

Id love to see it when it gets here, be worth a drive i think.

I wonder how much my H165 ute diff assembly weighs?

Go ca, cars already set up for ca, why give your self more hassles. If it's engineered with ca, should be no issue with another ca in there

Youve gone that far on the diff you might go as far on
the engine and get the lightest and most powerful NA
possible either full mechanical head SR20VVL or my fav
the QR25DE with modded cheap SR20DE factory full counter
weighed forged crank for a QSR23DE. Both will make over
200hp with little investment but VVL is available at
my105.com but sites down at moment fully developed except
throttle bodies too small using 4ag ones.

Ca18 will be way easier for you and with some decent na builds out there would be more than enough.

That said for less $$$ you could have ca18det in there and more power

haha thanks guys yeah it's a winters. and yeh that price includes axles, hub assemblies, 2 rotors and 2 sets of quick change gears.
unsure about a motor yet, thinking either worked n/a ca18 or a 4ag 20v, but it's already got a ca20 in it so ca18 swap will be heaps easier, and with some quads, 4-1's more compression etc should be a pretty decent engine.
other option is ca turbo but i kind of want that tough n/a response

Rods been using quickchange for years but
datto folk never spend that much usually
and for the price of some of the R31 setups
available a QC setup is 10 times better not
to mention 30kgs lighter.

winters is the brand name, there a tuff diff. did you get axles and everything for that price?