You don't want to convert everything to 5 lug. You want to install, at a minimum, the turbo sized brakes 266mm and pads, or the Elantra front brakes 258mm and pads.
Don't worry about going to twin piston brakes, as you don't have enough umph behind the engine to warrant that yet.
You will need:
better booster, 4:1 ratio turbo Colt/Mirage or 92-95 Elantra and re-use the spacer plate from the Colt/Mirage
turbo front brake calipers/brackets/pads/pad shims for bracket mounting and backing shim plates
turbo rear brakes calipers/brackets/pads/pad shims for bracket mounting and backing shim plates
turbo parking brake cables
eliminate the residual valve in the rear brake setup (if you have drums installed currently)
fabricate a left and right side bracket to hold the brake hard lines on the rear axle
brake booster hose with proper check valve - editted Aug 2014
http://www.amayama.com/search/?q=MB277029 This is the check valve as searched for the C53a Cyborg 1.6T
turbo proportioning valve
turbo master cylinder 7/8" with proper line arrangement - may match your lines at the moment and may not -I have not done the swap in this regard yet
Food for thought.
Quote:
Bigger breaks/5 Lug (Gotta look through the archives and figure out what I need)
Also find out why the engine is lacking so much power, because if something is about to go wrong, money spent on the brakes will be absolutely the wrong way to go.