HKS HIPERMAX IV GT Coilover Kit – 2005-2007 Subaru WRX STi – CLEARANCE



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SKU: 80230-AF003V Category: Tags: , , Brand:

The new Max IV sporty suspension. Awesome sporty drive with great control and comfortable ride in the street. It’s perfect for daily street drive with style and performance. You and your passenger can have a comfortable ride even with a low-down.

Single Tube Damper Design

Mono tube dampers allow for more accurate and stable control and adjustment of dampening. Lower ride height and centre of gravity gives a more stable ride.

Dust Boot

Protect the shaft from the flying stones.

PNE Coating

Using this special surface coating provides 5 times better durability over standard galvanising. This prevents build-up around the threads of the adjustment areas allowing for easier height adjustment.

“M Shaft”

With the new design of cylinder shaft since the HIPERMAX M-1, MAX IV increased the cylinder shaft size to have a firm damping even at a little stroke range because of the optimized oil pressure characteristic. We mainly adopted this to the rear damper that can have a better driving experience.

New Design Needle

Newly designed needle has been used to revise the very low speed and middle and high speed dampening which is key to a comfort ride.

Reduction of Unsprung Weight

In order to reduce unsprung weight, bracket, ride height adjusters and lock nuts are made from aluminium. (Not for all vehicles)

30 Step Damping Force Adjustment

30 levels of dampening adjustment allow fine tune adjustment for street or circuit.



Damping force adjustment30 steps30 steps
Base valve
Height adjustable lower bracket
Upper mount
Inverted/Normal typeInvertedInverted
Damper/Spring layoutCoiloverCoilover
Spring rate change at factoryPossiblePossible
Damping force adjustment with wire
Helper spring
(Spring rate N/mm)
Ride Heightmm
Factory *2Test dataAdjustable range
High – Low *3
Drivable range
High – Low *4
FRONTRide height *1642693 ~ 635693 ~ 637
Against stock-460 ~ -580 ~ -56
REARRide height *1638667 ~ 628667 ~ 634
Against stock-280 ~ -380 ~ -33


*1. Height from road surface to fender arch.
*2. Height at factory is the data tested at HKS with the setting of Full Kit. (HKS’ recommended setting.)
*3. Adjustable range (However, the lowest value may not be road legal.
Even within the adjustable range, car body, arm etc. may contact. In such case, it will be hard to drive.
Damper oil leakage or any other problems caused by low ride height setting from the factory setting will void the warranty of the product.)
*4. Drivable range that there is no contact of car body or arms etc. (However, change of tire/wheel size may cause a problem.)
Caution). Actual data depends on each vehicle.

Kit information

Spring of Full Kit

Spring rate N/mm(kgf/mm)59+19 ( 6+2=8 )38+19 ( 4+2=6 )
Free height (mm)250250
Spring typeStraightStraight Barrel type
Recommended range to change spring rate N/mm(kgf/mm)±20 ( 2 )+20 ( 2 )

Specification of damper

Damping force (Rebound/Damping)N*820 / 400400 / 220
Default position of dial1515
Remaining damper stroke (Rebound/Damping)mm70 / 56 (6)78 / 91 (11)

* The value of the damping force is at piston speed of 0.1m/sec.

Setting data

DefaultTestDrivable limit
High *
Drivable limit
Low *
DefaultTestDrivable limit
High *
Drivable limit
Low *
Length of
case (mm)
Set length(mm)
Length to ride hight
adjuster (mm)
Lever ratio1.101.08

* Refer to the above explanation *3 of ride height information for drivable high and low limitations.

Test vehicle information

Vehicle weight kg897 (880)612 (580)
Tire size (Air pressure) kPa235 / 40 – 18 ( 220 )235 / 40 – 18 ( 220 )
Wheel size8.5 JJ × 18 off 508.5 JJ × 18 off 50
Test data0 mm / -1°12′+2 mm / -1°48′
Standard value0 ± 3 mm / -0°30′ ± 45′0 ± 3 mm / -1°40′ ± 45′

* Test data at HKS.

Parts List  * It may be changed without prior notice.

Additional information

Weight31 kg
Dimensions138 × 59 × 41 cm


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Models suitable for this product

SubaruImpreza2005 - 2007WRX STi
SubaruWRX STi2005 - 2007

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