I am looking to relieve the whistle that comes with a aftermarket intake on our mk6 gti's. but theres the thing I want performance from the new DV if I can but heres what I wanna know, apparently the REV D and GFB DV relieve the whistle, but for little more than double the price of the REV D, the GFB DV looks like a expensive fix for a whistle. So can you guys help me out as to whether or not the GFB DV has a proven ability to increase performance in some way that would warrant its price tag over the REV D.