[Sal]

any type of power increase on the gt will require a turbo.

if you wanna go NA then swap the 1zz with a 2zz engine and trani and:

Daily Driver $50 - $2000
Step 1 - Injen CAI (AEM or E-bay w/ Blue bomber mod if you don't intend to continue to step 5 and beyond.)
Step 2- Exhaust - Magnaflow - RSR, something free flowing. TRD is not free flowing.
Step 3 - Ceramic coated PPE race header with NO cat.
If you can't afford PPE then Ceramic coated ported stock header with decat
Step 4 - Lightweight flywheel

Weekend Warrior $2000 - $4000
Step 5 - Power FC w/ higher rev limit
Step 6 - Cams - piper stage 3s.
MWR valves and springs
Circuitworx oil pump gear
Underdrive pulley on alternator

Entry level race spec $4000 - $8000
Step 7 - Ported & polished head
Bored out throttle body port matched to intake manifold
Intake manifold port matched to head
Header port matched to head
Mahle 12.3:1 pistons
Polydyn or Swain ceramic coating on underside of head and valves & top of piston
Polydyn oil dispersant on crank and rods
A/C delete
Underdrive on water pump
Injectors
Fuel Pump
MWR bearings
Head and block studs
Crower rods (lighter than stock)

Serious Race spec $8000 - $15,000
Step 8 - Race spec Intake manifold (ITBs optional)
Carillo rods
lightened crank
13.0:1 or higher CR wiseco pistons
LR sleeved block
Custom CAI / air delivery system

Pro race / Baller
Step 9 - Custom Dry Sump
Lighweight clutch disc and pressure plate
Electric Power Steering conversion
Custom Electric water pump
Titanium Valves, retainers & keepers
Titanium Rods
Custom race header with Burns collector and straight through titanium exhaust or open non merge header