Single turbo upgrade
 

Hi guys,
I posted this message in the 3rd gen specific but thought that I might get a better response in this column.
My friend has a 94 rx7 and is thinking about doing a single turbo upgrade since his stock twins is old and leaking oil.
Need recommendations on which turbos are reliable and streetable with big enough gain on the fd.
considering apexi rx6 isamu kit, t04s and t04e with pfc computer.
Anyone has experience with these turbos?Problems encountered?drivability?durability?
Need responses, recommendations and suggestions?
Btw, since we are in the northwest, most likely we will take the installation and tuning to xcessive since I have heard lots of good things about Ralph.

Victor