I installed a Fujita CAI on my '04 i4 Tiburon and I felt a bit more oomph in the 2500-3000 RPM range. I didn't dyno though.
If you're planning on staying NA (naturally aspirated, as opposed to forced induction like super/turbo charging), then the most common pathway is to install intake, exhaust, headers, and a lightweight or underdrive pulley set.
As for me, I'm going only as far as intake/header/exhaust. I'm just waiting on my Injen SES exhaust system (stupid backorder...).
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='04 Tiburon, Silver, 4-cyl, 5-spd manual
=Mods: Fujita CAI::Megan 4-1 Header::Injen Super SES Exhaust::TWM short shifter::Slave Cylinder mod::ARK DT-P Coilover::ARK Front & Rear Strut Bars::Progress Rear Sway Bar::Clear Corners::Black Altezza Tails::'08 Tib 17" rims::Tuscani badges (hood, trunk, steering wheel, ignition, mission plate, e-brake, wheel caps)::Sony CDX-GT320 radio::Vent Rings::Billet antenna::Aluminum pedals::
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