2006-2011 Honda Civic Si Mod Guide

2.0L I4 K20Z3 (K20Z3) • 197 HP / 139 lb-ft • FWD

197 stock HP

5 parts

5 categories

Best Performance Mods for the 2006-2011 Honda Civic Si

Looking to get more power out of your Honda Civic Si? We've cataloged 5 performance parts across 5 categories with real-world HP and torque gains.

The biggest single gain? The Hondata Hondata FlashPro (Tune/ECU Flash) adds +15 HP on its own.

Build yours in the interactive builder →

Intake

Cold air intakes, short ram intakes

Injen Injen SP Cold Air

SP1572

+8 HP +5 lb-ft

$300.00

Injen SP tested

Exhaust (Cat-Back)

Cat-back and axle-back exhaust systems

Skunk2 Skunk2 MegaPower

413-05-1563

+6 HP +4 lb-ft

$550.00

Skunk2 catback

Headers/Manifold

Long tube and shorty headers

PLM PLM Header 4-1

PLM-K20

+12 HP +8 lb-ft

$350.00

PLM 4-1 header

Throttle Body

Enlarged throttle bodies

Skunk2 Skunk2 70mm TB

309-05-0080

+5 HP +3 lb-ft

$280.00

Larger throttle body

Tune/ECU Flash

ECU tunes and flash calibrations

Hondata Hondata FlashPro

FP-CIVIC

+15 HP +10 lb-ft

$700.00

Hondata FlashPro

Ready to build?

Use our interactive builder to pick your parts, see total HP gains, and simulate quarter-mile times.

Open the Builder