No, the weather is still crappy and cold here. Usually, May 24 is about when it gets decent outside and the ground is solid enough no to sink to the core of the earth in your own backyard.
I've seen boat-lore that quotes a 10% gain in top end power though. I contacted Andy Brown about his marine .67 pipes, I might replace the MACS with something more, and I hate to use the word.., "radical"?. Ech.
Oh yeah I had to grind the blade cuffs to fit the 2" spinner. I'll have to check but I'll take a wild guess they fit a 40mm spinner.