i've talked to people who have the rearmount, and the damage form outside really isn't a factor. maybe a plus is since its in back, more room in the bay for mods?
Do research on why STS turbos suck. Room in the bay doesn't leave room for more mods, thats just stupid.
2011 Mitsubishi Lancer GTS - DD mode
1991 Mitsubishi 3000GT - Many mods to come