I have this on my 06 and I think its great! I can't say what the gains are if any, but the seat of the pants feel says there was. I didn't need any kind of a tune since the intake was made to work with the stock program, I don't know if it will help to get a tune also. I take it its not a popular CAI though as you can tell since nobody else has replied, but there are tons of tuners out there that will tell you that most intakes are pretty much the same with these cars. Get what you like and what fits your budget, thats just my opinion.
