Im new on this forum and have been doing a little research on how to boost the 2.4 engine of a sunfire, atm I own a Talon TSI AWD and Im planning to boost a Sunfire, I have read that the stock engine can hold up to 6psi without problems and if you wana go higher then got to rebuild the engine and get some better pistons. Here is a little shopping list:

Rebuild Engine
3inch Exhaust system
2.5 FMIC Pipes
T bolt clamps
Couplers
SS Brake Lines
FMIC
Evo III 16G
Fuel Injector Clinic - 650cc
Aeromotive FPR
SAFC NEO
Walbro 255
Wide Band w/gauge
Oil Pressure Gauge
Boost Gauge
EGT Gauge
BOV
Turbo manifold
Downpipe
Better clutch
Ceramic Brake Pads

My real questions is if there are some other pistons than Wiseco since they are a lil bit expensive and wut other internal parts should be change, also if the water pump and oil pump will work for the project, Im planning to go for 20psi/300hp but I don’t have experience with this engine and would like to now wut else should I add to my shopping list also a lil help would be appreciated