What can i do to add serious horsepower to my stock 87 supra auto-n/a?

[Supra2NR]

well for starters
do a 7mgte swap
convert to manual tranny
new racing clutch
lightweight flywheel
new crankshaft
machined heads
get it retorqued
new pistons
new connecting rods
upgrade the turbo
new injectors
new fuel pump
of course this is jus the tip of the iceberg

but jus to get you off the ground
what about intake and exhaust
two most common upgrades that should be done to a car

check this guy's list

Originally Posted by MK1 7MGTE

JE 7.5:1 low comp pistons
Total-Seal Piston Rings .
Stock Con rods Race prepared.
Crankshaft Race prepared.
block Bored and honed with torque plate.
ARP Main stud kit for extra block rigidity.
ARP Head stud kit.
Clevite77 Rod and Main bearings.
full engine gasket set.
HKS 1mm Stopper type gasket.
Stock flywheel lightened, Surfaced, stepped, zero balanced
Complete rotating assembly electronically balanced
Cylinder Head and Intake Buildup:
Head cleaned, blasted, and pressure tested before any work is performed.
Nothing works better than the stock camshafts in a 7MGT. You can move the power around but you will not make more power.

Heads are Turbo Ported and polished
Chambers are CC’d and polished.
Intake manifold Match Ported to the head
Stock throttle body is enlarged 5mm over stock.
Intake manifold match ported to larger throttle body.
All new valve guides installed.
Valves replaced as needed.
All valves 2000 degree high heat coated.
Heavy duty valve springs.
3 angle racing valve job.
Hand lap and back-cut an all valves.
Valves adjusted and all shim work done.
Blanchard grind head surface.
New Timing Belt
Adjustable Camshaft gears ( Slider Type ) .
programmable engine management system,
660 injectors,
62-1 or T66 Turbo,
Upgraded Intercooler and plumbing,
Racing bov valve,
(2) Bosch racing fuel pumps.

Turbo System Components:
Turbocharger upgrades:
T3/T4 Hybrid Turbo unit Up to 375 HP
T04E Turbo upgrade Fast spooling unit for up to 450 hp applications
T04B Turbo upgrade
60-1, 62-1, T66 Turbochargers . Applications up to 800 HP

MOD EDIT - I added whose upgrades those are. - dcrusupra