Has anyone out there had a problem with there bi mod exhaust working after having a cam put in ur zo6? I took mine to dealer to have fixed and they told me it woudnt work anymore because my car is cammed up? so I just pulled my hoses off the muffler so they would open but it doesn't make sence to me because when the hoses are on the exhaust closes so that tells me that theirs enough vacume if anyone has this problem let me know what to do thanks.