To achieve a total power output above 400 horsepower, your car only needs a tune and basic bolts-on. Get a BMS Stage-one tune in it or other decent tune/remap depending who is around in your area. Then doing Airflow, fuelling, and exhaust upgrades will remove the potential restriction ...
Typical stage 1 mods often include: Panel air filter, Alloy wheels, Sports exhaust, Engine Tunes/Remapping, Lighter flywheel, Suspension upgrade (drop 23mm - 43 mm.).Typical stage 2 mods often include: high flow fuel injector, Ported and polished head, Power/Sport clutch, Fast road cam, ...