just stay away from the xspower ones ,
my mate built a cossie mk 2 for a guy and fitted one,
had it off more times than it was on getting it welded,and was always blowing out, pure scrap,
ended up putting a std 2wd item on, but it was tight for room.
when it comes to aftermarket manifolds imo you really have to spend good money to get one thats not going to break your heart