Turbo Kit for Honda Civic Si K20 (2006-2011) 2.0L

Complete T3/T4 turbo kit for the 2006–2011 Honda Civic Si (FA5 sedan / FG2 coupe) with the 2.0L K20Z3 DOHC i-VTEC. Built around a stainless tubular K-series manifold, hybrid T3/T4 turbo, front-mount intercooler, 35mm external wastegate and a full set of boost, fuel and cooling support parts. This kit is for the Si's 2.0L K20 only — it does not fit the 1.8L R18 in non-Si Civics (DX/LX/EX), and a tune is required.

Why this kit

• TIG-welded 321 stainless tubular manifold with large primaries and T3 turbo flange
• T3/T4 hybrid turbo, .57 trim, .50 A/R compressor / .63 A/R turbine
• Front-mount aluminum intercooler with 2.5" inlet/outlet plus 2.5" aluminum piping kit
• Boost controller, BOV, 35mm wastegate, adjustable fuel pressure regulator, catch can and billet fuel filter included
• Electronic turbo timer and slim cooling fan for heat management

Package Includes

• (1) T3/T4 hybrid turbocharger — oil fitting gaskets & mounting studs
• (1) Stainless tubular turbo exhaust manifold (T3 flange) with gaskets & bolts
• (1) Front-mount aluminum intercooler (2.5" hot inlet / 2.5" cold outlet)
• (1) Universal aluminum intercooler piping kit: (2) 90° bends, (2) 60° bends, (2) 45° bends, (2) straight 2.5" pipes, (2) 2.5" 90° silicone couplers, (6) 2.5" straight silicone couplers, (16) stainless worm-gear clamps
• (1) Manual boost controller with install kit
• (1) Blow-off valve with install kit
• (1) 35mm external wastegate (2-bolt) with gaskets & flanges
• (1) Slim reversible cooling fan with mounting tabs
• (1) Electronic turbo timer with pigtail wiring
• (1) Adjustable fuel pressure regulator with gauge
• (1) Oil catch can with install kit
• (1) Billet aluminum high-flow fuel filter (6AN fittings)
• (1) Coolant temperature sensor bung (38mm)

Turbocharger & Manifold Specs

• Turbo: T3/T4 hybrid, .57 compressor trim, .50 A/R compressor, .63 A/R turbine
• Compressor inlet 3" / outlet 2"; 1/8 NPT oil inlet; wet-float bearings
• Manifold: 321 stainless, tubular, T3 turbo flange, polished

Exact Fitment — Honda Civic Si

• 2006–2011 Honda Civic Si coupe (FG2) and sedan (FA5), 2.0L K20Z3, manual transmission (all US Si models were 6-speed)
• Also suits 2008 Civic Mugen Si sedan (2.0L K20)
• Not for 1.8L R18 Civics, Hybrid, GX, or 2012+ 2.4L K24 Civic Si
• Verify manifold-to-head flange, intercooler mounting and front bumper clearance before installation

Not Included

• Downpipe / exhaust beyond the turbo flange
• Turbo oil feed and return lines, and oil-pan drain bung
• Larger fuel injectors and fuel pump
• ECU tune / engine management
• Upgraded clutch

Installation Notes

• A proper tune is required before driving under boost.
• Intercooler piping is universal and may require trimming or light fabrication to fit the FA5/FG2 bay.
• Oil return must drain by gravity; pan tapping or a drain bung is usually needed.
• BOV and wastegate flanges are welded at the installer's discretion.
• Seller states roughly 50–100 hp gain on a stock motor at about 8 psi. The "485 hp" figure is a marketed hardware ceiling with a built motor and supporting mods, not a dyno result.
• Let the turbo cool down before shutdown — the included turbo timer helps automate this.

FAQs

Will this fit my 2009 Civic EX?
No. The EX uses the 1.8L R18. This kit is for the 2.0L K20Z3 in the 2006–2011 Civic Si.

Is it a bolt-on, turnkey kit?
No. You still need a downpipe, oil lines, fuel upgrades and a tune. Expect some piping fabrication.

How much power will it make?
On a healthy stock K20Z3 at low boost (~8 psi), the seller expects about 50–100 hp more. Higher numbers need a built engine, fueling and a professional tune.

Can I keep A/C and power steering?
The seller says A/C and power steering can usually be retained, depending on the routing.