HKS GT Extension Kit for 2007-16 Mitsubishi Evo X [CZ4A] 14019-AM002


2007-16 Mitsubishi Evo X [CZ4A]

Extension Kit by HKS for the Mitsubishi CZ4A Evo X

HKS PN# 14019-AM002

Part Number: HKSEVOX34 Vehicles: , , , Brand:

Please note that this brand offers a wide variety of parts, some of which are kept in stock. However, not all products from this brand are kept in regular inventory. As a result, lead times can vary (from 1 day to weeks or months). Following your order, a representative will contact you to explain the order process, and provide an estimated timeframe for delivery. . Following the discussion, should you choose to continue with the order there will be no further option for cancellation (if there are any concerns regarding lead time, please advise us immediately during the initial follow-up). Please order with confidence, as at the time of the initial contact and after being informed of the estimated lead time, should you choose to cancel, you may do so within 1 business day. You are encouraged to read and understand the full terms and conditions of the sale here.


Code No. 14019-AM002





The key item of exhaust back pressure control with knowhow of HKS CZ200S (CZ4A).
Maximization of performance from stock turbine is the concept of the product.
Extension portion and Front Pipe portion are connected with a flexible joint.
It improves “durability” that is an important factor of tuning.
It offers new tuning possibility for EVO X.



◆ Features
  • As stock turbine is small, it has good response at low rpm. At high rpm, due to exhaust resistance, feeling will be worse. By improved exhaust efficiency, boost pressure will increase earlier at low rpm and power & torque will be increased for whole rpm range up to high rpm.
  • CAD designed complicated but ideal shape is manufactured with lost wax casting. Since lost wax casting items do not have welding portion, there is no problem of cracking by heat and the smooth surface guides exhaust gas flow smoothly.
  • The turbine outlet is 2 ports independent shape for swing valve side and turbine impeller side to reduce resistance due to interference of gas.
  • For street use, connection of extension and Front Pipe is flexible joint type like stock system to reduce vibration and to improve durability.
    Even lower side exhaust part is hit, it prevents damage to the engine or turbine.



Component Qty
Extension 1
Front pipe 1
Stud Bolt (M10) 1
Flange Nut (M10) 1
Plane Washer (M10) 1
O2 Sensor Bolt 1
Gasket 1
Manual 1



STD HKS Remark
Volume of extension 3.273 X 105 4.103 X 105 About 25% UP
Inner diameter of outlet φ57 φ59 About 10% UP
Manufacturing method Casting lost wax
Thickness 4mm 3mm
Material SUS304
Close noise level silent HPmuffler+ metal catalyser
(R:93 / L:92dB)



“Hosepower” & “Torque” increased at entire rpm range!!




Twin port VS Single port

Twin ports type increase boost pressure level quicker!!


Reduce exhaust back pressure reduces load on engine
and stabilized performance!!

If interested, please contact us at Bulletproof Automotive for more information regarding pricing, fitment, shipping costs, as well as installation recommendations.

Part #: 14019-AM002