exhaust on lowered blazer

[HAVA79]

I have a 79 blazer with a four link and bags. the fuel tank is in the stock location, between the frame rails behind the rearend. with the panhard bar placement my exhaust guru is telling me that he will need to put the exhaust UNDER the rear. I really dont like this idea, but as it stands there is really no room otherwise. My question is anybody done this or have any imput? One more small thing, when the exhaust get the the rear of the blazer he(guru) wants to exit the vehicle behind the rear wheels. I want it to exit straight out the back. But he says that will only fill the inside up with exhaust when the top is on and the window is down. (the top will be off 75% of the time). thanks for any imput...........jesse