Whatever. I want to know about ET's, trap speeds, and lap times. If you don't go for that stuff, and you want to get off easy, a dyno shop and a truck scale will suffice.
But this "I noticed a big difference" stuff doesn't convince me. Have you heard of placebo effect? It sounds faster, you think it is faster, so it feels faster. Take it to the strip, take it to the track, before & after. Or at the least, an accurate scale and dyno. I don't go for feel-good stuff, I want numbers, from my bike, as well as anyone else's. Convince me that the cost is worth it, for something more than poser value.