The Volant intake fitment issues have been taken care of with their redesigned unit. Although, there are still companies out there that have the old units in stock still and are selling them out before ordering new ones. This is a fact that I have found over the past couple of months working with the Volant stuff to figure out the issues with them.
The noise associated with the Volant installation is not exclusive to the Volant intake. Any aftermarket intake you install that eliminates the stock resonator will cause the same increase in noise under throttle. The factory resonator is what keeps it quiet.
There IS a CHANGE in airflow with the installation of an intake. This does effect the tuning of the vehicle. The MAF sensor is suppose to read a certain volume of air and the aftermarket intake changes that flow, whether it is a great increase in volume or not and whether the change in average intake temperature is a lot or not; changing those parameters will affect how the engine runs. I have seen many people wind up with losing mileage numbers when installing an intake without tuning. That doesn't mean that they will all be that way, every single vehicle out there is different, driving habits and conditions play a large role in it as well. But in the end, if you change the intake airflow OR exhaust flow (not including just a catback exhaust) you will need a tune to take FULL advantage of the intake.
Backing up this point, I have actually seen cold air intakes that cause a major loss in power and in some cases caused a CEL because the MAF sensor location wasn't designed into the intake tube properly and caused major changes in the airflow readings through the ECM.
---------- Post added at 10:36 AM ---------- Previous post was at 10:32 AM ----------
Also, since it was mentioned. I am NOT trying to sell anything with these posts. As a matter of fact, I have stopped recommending the Volant intakes for the time being. This has nothing to do with fit and finish and everything to do with the turn around of shipping the new models drop shipped from Volant. They are averaging 4-6 weeks for shipping new intakes and that is just too long for most customers.