I put the turbo muffler (center in, out on top) in vertically to closely match the OEM round mufflers in/out locations....


Anyway, I forgot to mention that I also want to put a 1/4 wave exhaust on the rear section to get rid of the ~3500 rpm drone when going up the Grapevine


http://www.performancetrucks.net/forums/sponsor-sales-specials-135/how-build-exhaust-resonator-tube-eliminate-drone-489463/


I figure the /\ shock locations would attached behind the round tube that's above / in front of the axle, and in front of the axle near the springs.     I was going to design with worst case on the axle,  front/top of axle next to springs at spring height.

I'm worried about missing something when a side is at full compression.........