K4M1K4Z3-Legacy

Hey!

Im new to the forums before i ask my question, let me introduce my self shortly,

I live in Sweden im 21 ive owned a 2 Imprezas both where RHD JDMs, ive also owned some Volvos, a Saab, an EVO I , BMW E30 and a Sierra Cosworth when i Turned 20 I bought a R33 GTR wich was fully stock I finished my project a week ago and it develops 767hp with its 2.8l HKS Stroker engine and To4z single turbo. During the project i needed a "fun" 4WD car wich i could drive in the winter so i bought a Subaru Legacy GTB E-Tune with 6 speed trans, I also have a Volvo 940 as a everyday car and I also own a Supra mkiv wich ive had for about 6 months its BPU right now.

So now i want to tune my Legacy to about 350-400hp, Ive heard you can single turbo convert Legacys with Impreza parts what do you think of that?

Can you suggest any good sites for buying parts?

Should i upgrade the Twin Turbos? How much boost can they handle?