RotaHavik

are jc cosmo and fd3s throttle bodys the same?

nah, jc got chokes, fd chokes in top manifold, jc bigger, fd better flowing,

what if i change the top intake maifold as well?

so u wana run fd lower half an jc half? tps is different to, id use fd throttle body on jc intake

is the inlet to the jc plenum the same as the outlet from the fd throttle body? and would a jc upper manifold fit a fd lower manifold?

slighty different, but ezy mod to make work, nah u gota use whole thing or mod ur lower half to suit, or make adaptor,

and the fd has 4 nuts holding on the compression tube and jc has 2
depending on what you mod what to s5 s6 its easy as and dont need a adapter