exhaust downpipe will need modding. you need to chop about 2 inch out from just behind the turbo flange & add it into the downpipe.
ask martin at reyland he knows how to do it
turbo damper is not a bad idea either to help support the extra weight.
also you will need a 2wd heatshield as the 4x4 one won't fit with a 2wd manifold.
it does sacrifice some low down torque but it does pull harder on the top end. if yours is a road car I would stick wit the 4wd manifold. if its used for fun & on track then do it.