So, one caveat--I haven't gotten much ride time on this yet (about 5 hours so far), although I won't be even a little surprised if it lives up to the hype. This review is for a stage IV intake kit, with PCV and SAS removal.
First, customer service. 6 stars out of 5, seriously. I can't rave about these guys enough. This is expensive stuff, and if you are putting a bunch of mods on a KTM 1090 R Adventure, you can (and I did) basically add half the cost of the bike to this. So, lots of emails exchanged before I pulled the trigger, and Chris and Lee and others (all clearly experts at this) patiently pointed me in the right direction. Then I got the kit, started putting it on, realized they had sent the wrong TVS--no problem, had a reply to my email in about 2 hours, which was actually later than the UPS notice that I had a package coming...it's 2018, I do a lot of e-commerce, and I'm pretty used to the caveat emptor style of indifferent service--these guys, however, are making a bad-ass product and backing it up with their knowledge and expertise, and doing it with style. Mad props.
The kit--the amount of sweat and engineering that goes into this is impressive. Everything, without exception, fits right the first time. There is no modification. There is no cussing. I did the whole install (including taking the tank off, kind of a pain in the butt) in about 4 hours. I'm not a mechanic. The velocity stacks are absolute art. Each tiny little fueling dongle is soldered and shink wrapped like the wiring inside a Spaceman guitar effect (check it out--it's borderline obsessive).
The masterpiece, though, is the instructions. They come written on clearly xeroxed sheets. You can find them on you-tube. Most of them are in PDF form on the website. They don't beam them right into your skull (yet), but I found at least two sources for each portion of the install (putting the PowercommanderV in requires connecting to a specific wire in a bundle of about 20, and I had to look at the youtube vid to make sure I was getting the orange and yellow wire, not the yellow and orange wire). Follow these step by step. When it says pause here to do the SAS removal, do it. Smooth.
The end result? Immediately, the bike runs smoother, with a more linear throttle response. This is not subtle. I'm not a long-time motorcyclist, but it was obvious to me that this really wakes the LC8 up nicely. More power and grunt where you want it, not choppy at all, although the idle is a little rougher than stock (the front turn signals wiggle a little at stop lights). Minimal to moderate noise increase, but in a range (low) that is not unpleasant or harsh, and does not require earplugs even with my dirt-bike helmet on (not a very quiet helmet).
So, there you go--great engineering and customer service, the details have already been sweated for you, superb components, and the best instructions in the business. I liked it enough that I'm thinking of buying another KTM so maybe I can do it again...not entirely joking here. It was almost therapeutic.
I don't put ever stickers on stuff, but I put the Rottweiller Performance sticker on the front cowl.