lt1 beast

I have and lt1 with pacesetter long tubes off road y pipe and a magnaflow catback. the y pipe extends further than the origional cat was mounted. I have a magnaflow spiral flow cat and as considering mounting it in the rear axel channel. are there any other options since it will hit my driveshaft if i mount it upstream? I also have minimal ground clearence so bending the pipes downward is not an option.