It's a controversial topic but I had problems with some of the jetting issues on many of the 144cc builds I did (CR134, KTM144, RM144, KX144 etc...)...
The KTM was a jetting nightmare. I tried everything and then I was given the opportunity to try something. I was the first mag to test the iCAT. I put it on the KTM144 and it didn't run a bit better. I was riding on a track where it was wide open everywhere... there was one section I didn't like and I turned around and started to roll it on - WHOA - the bike had so much more midrange, and was so much more crisp I was shocked! I plugged it in, undid it. Plugged it in and tested again, undid it again... there wasn't a single question that the roll on power and the actual jetting woes almost completely disappeared.
As I was putting those words on the web - basically that the bikes jetting was cleaner and it pulled much harder without really offering any more peak power that I could see - my friend Timmy Ferry tested one and here is a full factory rider at the time and his words were almost exactly what mine were. Way crisper, pulled harder, but didn't really seem to offer any more hp just like perfect jetting... I mean I literally couldn't tell it was on there when I was holding it WFO - but man, get down there and have to roll it on some and it was like a different bike.
I got scoffed at quite a bit for my story but stuck with it and stick with it to this day - and the riders that raced with it stick with it... So consider trying one if you can get your hands on it. They seem to work really well on the 144cc bikes!
BTW they did a dyno test once and it showed no gains - but DYNO's of course the dyno was tested at full throttle SETTINGS... had they used 50%/75% throttle settings I wonder how much more power it might have been making than the stock bike! Only Donn Maeda from MXRacer Magazine now Transworld MX stepped up and said he saw a diff and liked it... Give 'em a shot. Tom Wallace was the last one selling them as a distributor here in America. He's a former factory mechanic and I believe he has a shop in Nevada now.
Peace, Mikeee P