Here's what my 2005 EX-250 Fuel Injection project bike sounds like.
It's not the kit you're discussing in this thread, this is a "one-of-a-kind" configuration that I put together myself. It uses a Microsquirt FI controller.
Best to watch it on a computer with good speakers, my laptop doesn't do it justice but it sounds just like I'm riding it when I watch on my home computer.
Link to original page on YouTube.