First impressions of the Fujitsubo is the sound it makes. Doesn’t make a rough, loud sound, doesn't burple, pop, or anything. It makes a very smooth purr which increases in loudness higher up the rev range you go, still keeping this smooth purring noise. As in gains…. I would say yes I can feel a difference it seems to 'pick up' a lot more quicker than it used to, its quite hard to explain but I can feel a noticeable difference in performance and the car goes like stink now. This might be however because the full Fujitsubo system seems lighter than just the standard baxbox on its own!
If you want performance and not a headache producing noise then Fujitsubo is top of the list, you probably already know how good the build is on these. Mine was fitted at TGM in fleet and even they where commenting on the quality of the exhaust, welds on it etc.