im trying to hit 400 is this ridiculous or do i have a shot

90 teg ls
1.8 litre
5speep manual
sound systems worth more than the car right now

You can hit 400 easy if you have a Phat Bank account.... ITRs pull 477hp
With a Good Turbo and Intercooler youll be around 250-300 im guessing and do H/CAI/Full cat back/Cams/ECU/wires... Basicly if you upgrade al thestuff you could make 400+hp P.S f you gonna do all hat Upgrade the Tranny(GSR trans) and get some aftermarket Rims w/ Hi Po Tires (Yokos :)..... Short Throw Clutch would be nice too.....

If you want to go 400hp+ the right way
I recommend:

Hondata stage 4b
Engine-bored, honed, cyrogenic treatement (engine,piston, connectrod,etc).
Connecting rods-Eagle/Crower
Pistons-JE/Crower
Piston Rings-Total seal
Crankshaft-Crower
Camshaft-Crower/Jun
Titanium valves-Crower/Jun
Valve Springs-Crower/Jun
Titanium Valve Retainers-Crower/Jun
Cam Sprockets-Crower/Jun
Ignition Control-MSD
Spark Plugs/Wires
Turbocharger kit-Drag Gen III T3/T4 kit
Turbo Timer-Greddy
boost/air fuel/oil/egt guage
Intake Manifold-ITR/Skunk2/Edelbrock
Radiator/oil cooler-Fluidyne
Radiator cap
Fuel injectors-RC engineering 550cc+
Fuel rail-AEM
Fuel Pressure Regulator- AEM
Fuel filter-AEM
Fuel pump
Header-DC Sports
Exhuast-Greddy EVO,etc
Clutch-ACT
LSD-KAAZ/Quaife
Flywheel-Jun/etc

THis should run you about $15k-20k

If i missed anything motor heads, please add.

possible to make that BUT I SAY GOOD LUCK AND HAPPY SPENDING!!!

i know mostly of 200 to 250 hp around, most tegs i have seen were around there...