if you can get one into a sedan, you can get one into a coupe

from what i was told, you have to cut out the spare wheel well in the sedan and then put the r31 tank in its place(might do it one day as i have an r31 tank and im over filling my car up, only been driving it for 2 weeks)

so you might be able to do the same for a coupe. but im not familiar with coupes and where they have their feul tank is, might be a better non "cut half the boot out" way of doing it