I personally think the manifold will not be the issue. Rather how other components are layed out within the engine bay and how the downpipe, and intercooler piping will be routed. The GA16 and QG18 have interchangable manifold's so I'd assume the 1.5 liters in the GA15 is from a difference in the bottom end components. As for the gasket idea it may not be a true indicator because the GA16 has two seperate gaskets for the exhaust manifold. It would tell you if the ports for the two mated cylinder's would match up but not weather the overall spacing was correct.
|