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I've done a lot of analysis on our FZ's intake system and along the way did an analysis on a possible intake mod of adding in a velocity stack to the outside of the airbox. The simulated change was a potential flow increase of up to 15% depending upon some variables. Not too bad potential, but that analysis was a very limited, static flow setup, just looking at the flow in the airbox. Nothing more. In short, this 15% increase would absolutely not be a 15% increase in actual, overall flowrate nor HP. It was a simplified assesment of whether it would help or not, and if helping, by how much. 15% was not too bad, but I didn't think it was worth the time to create it, and I didn't feel that it would actually increase perf by anything notable, if at all. Purely hypothetical. But, I had a new 3D printer I was dialing in and thought WTF, let's create one. I made a prototype that was a single piece, but it necessitated removing all the bodywork and tilting up the tank to get to the rear screws, so I made into two parts. The bottom part is very similiar to the MWR top but has the internal section designed to accept the press-fit stack itself. This allows you to only remove the seat to access the screws (the rear ones are a challenge but doable with a very small ratchet) and you can fully put the bottom section on without removing anything else. The stack portion slides through the opening and is a press fit into the bottom section, clicking and popping into place. I plan to put a small amount of RTV or silicone seal in there to help keep it in place and seal it, but it doesn't really need it. It's solidly mounted with the press fit. I used the recommended profile (ellipse based) but decided to make it a little shorter than optimal so it didn't go too close to the "roof" area of the intake volume. Still, it should definitely improve the smoothness of the flow, but I don't aniticipate anything else. This was more of a project to get the 3D printer ready to go . . . and for fun. The pictures below show the stack PRIOR to being smoothed by being in an acetone environment, so it looks a little rough. The acetone gently melts and smooths the outer layer of the plastic and makes it shiny and smooth. It's actually being bathed as I write this. Again, you can look up my analysis in two other posts and see what I found and a reference to this design change, so I won't go into it here. [ https://fz07.org/thread/7952/airbox-modification-simulation-testing-conclusion and https://fz07.org/thread/7684/intake-simulation-adding-velocity-stack and https://fz07.org/thread/7851/prototype-intake-filter-external-airbox ] In short, no, I don't think it will have a change that is felt as I ride, but, yes, you might see some change on a dyno - you might see a slight shift of the peaks or maybe a very small uptick to the numbers in some section. But then again, you could see a decrease somewhere too, who knows? One day, I'll get it on the dyno with the two mods I've made thus far. Just for fun - I don't think anything other than slight could be hoped for. And here it is . . .