you dont need a new manifold, your stock 2g manifold will work fine, its a nice upgrade on 1gs and will work great for your 16g, if your looking for 300whp id get at least a walbro 190lph fuel pump ( re-wire it too) maybe some 650cc injectors, 550cc might do ok too but might as well go alittle bigger to give you alittle more room in the tuning dept.