09-12 FE450 vs FE570 induction boot differences?

Does the 450 boot have velocity stack inside it? Anyone can post a picture of 450 boot?
The reason why I ask is that I'm installing custom 46mm throttle body into my 570, but I can't seem to fit the boot back even after heavily cutting it to make space for the enormous velocity stack the throttle body uses.

It just seems impossible to make decent airtight seal if I'm supposed to use 570 boot. It's already cut to point where I have to use sealant to fill it, and it's not even finished yet. I think I ruined a completely good boot if the throttle body is meant to be installed with 450 boot...

This is completely different shape than mine:







I have this one:






So looks like I need 390/450 boot...great!

Fun it is! But not when you're hungry and tired.

My mistake all the time when I'm working. Either I don't eat and slowly start loosing focus and get frustrated too easily, or start getting tired after countless hours doing a simple job that should only takes a moment to do when you concentrate and think what needs to be done.

I made a single big cut to the airbox today that took maybe 5 mins and managed to fit the airbox over the throttle body and velocity stack. Had to cut also a bit from the velocity stack on left side so it wouldn't touch the frame and fit well without excessive force. Will work more tomorrow and use old inner tube as a patch over the cut area and glue it in place for airtight seal. Then cut a tight hole for velocity stack and fit it into throttle body, as it's removable part which makes things a bit more easy for installing and maintenance wise.

We'll see how it turns out.