I removed the air tube and bushing from my GT, and drilled out the side air intake hole to 7/64 which is about the same size as the air hole in the deck (give or take a hair). Yes, its a clone, and like many of you I have several GT's so I decided to take a chance.
The results are a much airier draw, unlike most of my tank atomizers. I personally vape at around 15w to 20w depending on build, juice, mood, etc... very rarely do I vape below 15w (but occasionally I suppose I do)
I didn't have a counter sink to bevel the edges of the intake hole, so it makes a noticeable "whushing" (air moving, not whistling) noise. And as I mentioned way earlier in this thread, without the air tube I always get a tad bit of gurgle or slurping sound regardless of build and wicking style...maybe if I put some wick fluffed up at the chimney slots to kind of absorb the excess? I dunno never tried yet.
I do not know who makes my clone I drilled, I got it way before FT carried them, so... I do know its all stainless, and I personally feel some of the slurping/gurgle is happening at the collapsible collar/chimney.... it doesn't leak out of the air intake hole on the side, but when I clean it and blow IN TO the air intake some juice seems to come out of the screw hole posts??? maybe its just splattering everywhere when I force so much air through, but I personally think its actually coming out of the screw posts.....
Either way, the GT still provides one of the best vape experiences in my books.... with or without being drilled

honestly drilling didn't give me the night and day difference I expected, but the results are favorable IMHO.... and nowadays drilling a $20 clone as an experiment wasn't the end of the world.
My $0.02 (sorry dwcraig1, please dont think any less of me)