Ok so i just got done replacing my bcm and ignition cylinder and relearnign the keys i have an aftermarket system i wwant to put in although ive tried once and seems my stereo triggers the factory security....i put factory back in and did another relearn all is good now but my question is i got a 2000 gp gt with bose no onstar and some people say i need a bypass module and others say i dont its a problem with the car....im looking for some answers because the bose is nice and all but nothing like a 1000 watt amp in the trunk with some subs and a full function deck....so do i need a bypass module or is there really something wrong with my car