Turbo Exhaust Manifold Compatible with HONDA K20 Civic SI RSX T25 Flange w/W/G Hole

T25 Turbo Exhaust Manifold – Honda K20

Civic Si / RSX | With Wastegate Provision

If you’re building a mild-to-mid boost K20 setup and don’t need a massive T3 frame turbo, a T25 Flange Turbo Manifold is a smart, responsive option.

Designed for the Honda K20, this manifold fits popular applications like the Honda Civic Si and Acura RSX, featuring a T25 turbo flange and integrated wastegate port (W/G hole).

Because not every build needs a 700HP turbo lag monster.

Kinugawa Exhaust Manifold

Compatible with Honda K20A

Why Choose a T25 Setup?

T25 flange turbos are ideal for:

Faster spool characteristics
Street-focused builds
300–450HP setups
Daily-driven turbo applications

You get quicker response and usable powerband—especially on stock or lightly built K20 engines.

Key Features

T25 turbo flange
External wastegate provision
Stainless steel construction
Reinforced collector design
Direct-fit K20 orientation
Compatible with Civic Si & RSX chassis

Translation: responsive boost without overkill.

【APPLICATION】 -　Compatible with Honda K20A ，【FLANGE】 -　Flanged for T2 / T25 based Turbocharger. -　35mm / 38mm Wastegate Flange ，【MATERIAL】 -　FCD 50 / Cast ，【ITEM CONDITION】 -　New ，【Kit Includes】Manifold gasket / stud kit

Performance Benefits

Improved spool vs larger frame turbos
Balanced mid-range power
Compact design for tighter engine bays
Ideal for street and canyon builds

Perfect for someone who wants boost—but still enjoys drivability.

Installation Considerations

Confirm turbo flange (T25) compatibility
Match wastegate size to port
Verify radiator and fan clearance
Always use new gaskets and studs
Proper heat management recommended

Because cracked manifolds and boost leaks aren’t part of the plan.

Ideal Applications

Turbocharged K20 Civic Si
Turbocharged RSX builds
Budget-friendly turbo setups
Responsive street cars

If you’re aiming for clean, quick spool power—this is the move.

Final Verdict

The K20 T25 Turbo Exhaust Manifold with Wastegate Provision is a solid foundation for responsive turbo builds on Civic Si and RSX platforms. Quick spool, compact fitment, and street-friendly power goals.

Because sometimes fast response beats big dyno numbers.

Specification: Turbo Exhaust Manifold Compatible with HONDA K20 Civic SI RSX T25 Flange w/W/G Hole

Brand	‎KINUGAWA
Is Discontinued By Manufacturer	‎No
Manufacturer Part Number	‎423-20117-005
ASIN ‏	B07GZD32R7
Date First Available	September 27, 2017
Manufacturer	‎Kinugawa

1 review for Turbo Exhaust Manifold Compatible with HONDA K20 Civic SI RSX T25 Flange w/W/G Hole

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Brian H. – February 17, 2021

First off it does not fit civic Em2 chassis with K24a2. I made an adapter to tilt and and lower it some to clear the brace below the steering rack so it would fit my 2871 turbo. Besides the fitment issue I’m very satisfied. Have 2,500 miles on it total no leaks no cracks. I’ve run 20psi briefly while tuning and just returned from 2,000 mile round trip from Pa to Gulf coast of Florida. It’s heavy it’s thick it flows well for a cast manifold and the ports and flanges are machined properly

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