I have had my GFB on my car for a while, and it's been running great. However, when I go WOT lately, I would hear this surging sound like a high pitch "gee gee gee" not the usual partial throatle fluttering sound. I can't figure out what exactly it is, am I leaking air or it's compressor surge? I thought surging only occurs when at partial throatle or when shifting? Thanks.