Oil spray? What oil mix ratio are you runnin'?
Exhaust leak I could see with that setup - mind you I like it, but I'd imagine you'd need to fab a one-piece steel header for that arrangement... perhaps tuck it a bit more in and down? I'm not sure where it's leaking from the pics - but without the springs attached there's nothing holding it together but the hi temp silicone hose... of which mebbe you need another piece of for a segment that's uncovered?
Ghost0 is around frequently and seems to love questions like this - I'll add "SBP" to the title so he'll be sure to see it