What is a XR6 gear case? Coned - I suppose you mean a add on cone on a normal gear case?A coned XR6 gear case would get you over 100 until it blew up. The small gear case is worth a couple of mph.
Ok, probably I have underestimated the difference between a 280 and a 200xs.I chased speed when I had a lightly modified 150 XR4 on my boat. Best of 89.7 with a Hoss Triton. Went 91ish with a 225 Promax and have been 93 with the 200XS. 90 is fast enough. Today at lunch in chop 82 was fast enough.
I did not expect it to be a 12mph difference.
This SS has been doing 98mph before with a 200xs gen 1, and maybe I should not think I could beat that with my gen2.