Everyone's got hyped about this when the like's of facebook is just as bad if not worse it's pretty easy to track people or just follow them home.. I'm starting to sound like I've done this before but honest I havn't
Let me try whatever your smoking mate lol I would break it if I was you especially with your circumstance's and bottom end, £400 for a healthy engine will be very lucky!
Your always going to get cooler air from the frontmount although top mounts do aid spool time but will collect a shit load of heat off the mani, people do run them on one bar set ups. More boost is more heat, heat is the enemy!
I would say 2 litre's for a 2k. 2k paints should not need lacquered as you should get the shine through the layers you build up on as for base coats you can add thinners to the mix so you won't need as much but always handy to have spare it just depends on what paint you want