I noticed that the weight of the turbo, wastegate and turbo manifold is a lot heavier than the stock header. Would this cause headlift on the cylinder head or maybe squeeze the head gasket more and cause a leak?

Is it a good idea to retorque my head studs?
I have a stock jdm b16a with stock headstuds
Thanks

 

no. just buy a manifold with good material and a good welder, no ebay!

 

Its a blox cast manifold

 

You could always fab up a support mount to the turbo if your worried about the head or the manifold.

 

You're fine. Cast logs are light.