GFB is not a super over produced product like the HKS ssqv or the Turboxs RFL, although when I was running my rfl at first, it was closer to normal than when it was on there for a bit. but Than when I finally went back to the stock bpv....night and day.
Not saying that you cant have a good brand/well designed one and be fine, because you can. But I also guarantee that if you guys ran them full recirc. than long term, you would enjoy them more.
2002 blaze WRX- sold:(
2011 Wrx limited
99 Fozz- sold
Eagle eye crew