well what my mate did on his stock 33 is this:
1/ put a pod on
2/did a burn out
3/car started 'jumping' going from low to high revs vice versa
4/he put the stock air filer back on
5/car went back to normal
so made me think it was the poddy aswell lol
as for my 34 i dont have a fmic, all i have is a full atmospheric bov and a custom turbo back exhaust which i got just yesterday!!
but only flutters on low revs...so i think its ok?