Hi Kris originally we used t25 garret units but they were too small made boost at 1800 rpm thru to 4500 . instant torque was great but highway driving just wore them out. so we upgraded the turbos and manifolds the new manifolds are shed 10 stainless steel and the new turbos are t3 's with steel exhaust wheels froma us spec z32 . now it make boost just over 3000 all the way to 7500 and anything up too 15 psi at 12 psi it make 400 rwhp
My new awd cobra I am still deciding on 1 or 2 turbos and weather to have the 2 as twins or sequential. decisons i have to make .
Regards OZ