Just depeds on his wants.
Clean install?
Money?
Tuning?
I mean if you want it just get it but people are pointing out the basics you have no answered in you initial posts.
If I were you a LS1 bolt ons and she will scream.
Rear mount turbo kits just dont tickle my fancy, So much piping and lines.
Last resort for myself would be a rear mount, however theres a guy from ciny running a stock ls7 RX7 with a rear mount trapping 140-150 ....