I had an Eventuri kit on my car when they came out a few years ago. It did give a nice induction noise alright. It wasn't very loud, but it was loud enough that when I removed it I really noticed the exhaust note again.
I didn't really give any performance gains, none that I could feel anyway.
I sold it after a year as I felt the money could be put to better use. I bought mine second hand though and got all my money back on it so that's a good option if you just want to try it out.
It would be more so for the induction noise than power gains, it did sound good on the YouTube comparison video I watched, I may bite the bullet and go for the karbonious unit at a later stage.
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