Like others have said, INSTANT throttle response, REALLY does lift up with ease in 1st and 2nd (no clutch, just pure power), gets up to speed faster and pulls harder then the stock carb, this really is a performance carb. The stock mikuni is great imo, it'll get to speed too, but with the FCR you'll get there much quicker, turned 1st and 2nd gear into monsters imo, and it jumps from 60 to 80 mph really quick now, does great both for bottom and top end. Once adjusted it idles nice and good, starts up right away, it really adds a lot of power, in the trails if you wot it real quick it'll just spin, on the street is where it really shines. Im not a jetting expert, but it seemed to run really good the way it comes from TT for me set up (MRD/SSW 3X3 Hot Cams) 1200 elevation. Took it to the trails, and on the freeway, got to mid 90's with it, its really strong, loving it, this bike is the SHIT for a 400!!