It does fight tight, maybe too much, there's little to no room between the oil filter and the header. I might try two sets of exhaust gaskets and see what effect that has with the spacing from the oil filter. My main problem is, this pipe leaves no room for the oil cooler or the deeper 650 oil pan and it would take another 8 weeks or more to get the sidewinder. So I'm more than likely going to get another pipe over the winter (not a carpy) but for now I'll use this.
I haven't any idea if its fat or lean, just rode it around the neighborhood, it not registered yet. It has 100 mains and 40 slow jets. On the up side, it does sound soo much better. Packed and wrapped the baffle to keep it as quiet as I can.