Thought I'd pick your brain a bit. I still have my boat set up with stock screws. We boat mostly Pineview, Willard and Bear Lake. How much improvement have you seen with the repitched vs stock? One thing to note, I was out on Pineview about a week ago and finally ran the boat at WOT on glass to see how much speed was scrubbed off at altitude. WOW! I was barely breaking 6600rpm. Just me, the dog and a half tank of ethanol free gas. I'm not looking for top end as much as I would like to gain back some of the performance. I read a few comments from people who have deleted some of the intake restrictions and used different screw pitches, like
@Williamsone46 did with his 2015. (Almost bought his boat)
Bryan, did you buy your boat from Adam or SouthValley? If so they probably would have repitched your screws to 4500' altitude. Every time I go to their service dept there is a line of 4500' altitude screws on their window before going back into their shop.
If yours are stock OEM and you have a warranty, SouthValley might be able to get your screws repitched by Impro's to 4500' altitude for free. That's where my high altitudes came from, but mine are pitched for much higher. Willard and Pineview are lower altitude. I think Bear Lake is pretty high altitude. I live across the street from Rockport, so I'm up 6558' at the house and about 6000' on the lake with how low it is right now.
Adam always said he would rather run stock screws with no ribbon... I politely disagree, even on Utah Lake, I would have run with at least a little higher altitude screw. I had really good results with the 3500' screw and ribbon delete at UL and BL. Up here, the 3500' screw is just too much pitch if I have the boat loaded with people and am popping 2 skiiers or wakeboarders. That and Rockport is so small that if I hit WOT, I'll be on the other end of the lake in a minute (or so it feels like) ;-).
Is it 6600 RPM on both screws? Is that at Willard and Pineview or at Bear Lake? I would expect that at bear lake, but not Willard unless you have default screws. 6600 is low, as I'm sure you know. If you pull your ribbon and replace it with an insert (and then of course put in an approved flame arrestor for anti-backfire) you might change that 6600 to 6680... but you're not going to reclaim 500RPM, I don't think, without a repitch.
I have done both as well (ribbon delete / flame arrestor) and re-pitched screws. If I want to, I can blow out my holeshot, but I'm not so young anymore that I go stop to WOT. Unless of course it's just for a moment to drench some kids on a tube. Also, I think the ribbon is a different size or something on newer boats (mine's a 2014). Not sure if the 2016's housing for the ribbon is alluminum or what ever, but I've seen some posts on that lately... if that is the case, be weary that the part numbers in my videos might not apply to your ribbon delete.
I'm probably going to be dropping my boat off at SVMS on Friday for shrinkwrap and winterization. It's getting about that time, maybe you can have them warranty re-pitch your screws to 4500' for free. If not, the repitch can be pretty expensive.
. Worst case, I have an extra set of screws sitting in my office closet.