when i am driving at low rpms like stopping at a stop sign, then continuing, upon acceleration i hear kind of a "swooshing" sound from under my car. underneath my car i have a magnaflow muffler and supertrapps. can anyone help?

Tom

1998.5 T-Red SVT Contour
#6044 of 6535
K&N (Thanks Paul)
tcomps@att.net
Aim: Paintball4life69
*Looking to sell svt to get mustang*