So one to Manifold and one pisser from head and one to headpipe then a T before stinger. Isolate the engine and exhaust, 2 in and 2 out
Yes, in manifold the out head overboard, option to run both outlets on your head overboard the way the yellow ski above is set up. Either way, personly Id go for 2, you already have it so utilize it. Would require a 3rd pisser though, so if that's more involved then you want to get then only one out the head
One in lower head pipe, then out the top of head pipe to a T, overboard and two stinger
Exhaust isolated from engine