Turbo Upgrade Advice

[clean2g]

I have a 97 GSX with ACT 2600 clutch, catback exhaust, boost controller and running at 15 psi on my stock t25. I want to upgrade to a bigger turbo but I can't get a front mount yet because of my parents. So I was wondering what are your thoughts on upgrading to a 14b and a supra side mount? With a supra side mount it will just look stock from the outside and my parents wont know I did anything. Also, what supporting mods would I need for a 14b upgrade, if any? I know it may not be the best upgrade but I think it would at least be better than my t25. I'm tired of getting harassed on the road and not being able to do anything about it.