Marking the Pipe for Hole Cutting

now that the fitment is good i am going to trace the outside and the inside so i know where the outside is and when i trace the inside then i'll know how big to cut the hole what do you think should the blowoff valve be perfectly horizontal or stick up a little bit i would say horizontal well that's my thought i'm trying to put it somewhere that it's aesthetically pleasing because you know i'm kind of looking at where the alternator is where this stuff is where it is on the pipe if you put it here it's going to look weird because it's right at the bend put it here it doesn't look that good because there's a big empty void right here so i'm kind of going to like you know look at all this like it's an art project or something everything has