I have an 8" 2bular on my 2012 supercharged Elise. Sounds great and quality is good. I'm sure on the 2006 version Jim from 2bular will be able to advise what's best for your needs - track friendly or more antisocial Sunday blast. He's very friendly on the phone. Others will attest that his delivery timings can be sketchy. Constant phone calls worked well for me and I got mine in just over a month
My advice would be to not go for the loudest exhaust possible, as although fun on short journeys, on any longer journeys it can get tiresome.
I haven't heard a Larini system in the flesh,just YouTube videos when I was doing my research. So can't advise what they're like.
If you're coming to LitP you can have a listen to mine if you like.