Randy,

Never hard secure the exhaust system to the airframe. Do what you see in
automobiles, use a flexible support or a spring.  Also never make a hard
connection between the two independent exhaust systems at the aft point.  My
exhaust example takes opposing cylinders and Y's them into a pipe which
exits out the lower left side. Thus, two sets of pipes are needed for the 4
cylinders.  Do not connect them in the aft area, else suffer the
consequences of cracking.

I have the oil cooler mounted like  you are suggesting drawing air from the
left aft  portion of the baffle system.

Bob Smiley
N94RJ