If your looking to gain inches its your triceps that hold the key, most people gave good sized biceps, the volume of your arm is triceps, specifically the long head
Noltil stings like fuck, leaves the muscle rock solid for at least a day... I've only ever used it pre contest, I suppose you could get a good deal of swelling if you used it pre workout regularly, doubt it would stay once you stopped tho
Unless your very lucky, site injecting with gear leaves you with weird swellings on you muscles, you can usualy spot it a mile off, altho if you have a lot if size it will be less evident