Sports Springs Spec-R


Note: Vehicle drop rate is based on the year, model and option of the test vehicle, and may vary based on each vehicle condition. All testing is done on manufacture's original shock absorbers. Replacing the shock absorbers to aftermarket could change the ride height. Due to continued engineering advances, product specification may change without notice.

ACURA Code Year Part # Spring Rate Drop
Front Rear Front Rear
Kg/mm Kg/mm Inch Inch
ILX 12-15 4H915R 4.7 5.4 -1.2 -1.0
TLX (TYPE S) 21+ 4H920R 10.2 7.4 -1.0 -1.0

AUDI Code Year Part # Spring Rate Drop
Front Rear Front Rear
Kg/mm Kg/mm Inch Inch
S4 09-16 4X923R 7.2 3.5 -0.9 -0.6

BMW Code Year Part # Spring Rate Drop
Front Rear Front Rear
Kg/mm Kg/mm Inch Inch
335i E90, 92 07-13 4X905R 4.0 11.0 -1.0 -0.8
M3 E90, 92 08-13 4X903R 5.0 12.0 1.0 -0.7
M3 F80 14+ 4X909R 4.8 12.8 -1.0 -0.4
M4 F82 14+ 4X908R 5.0 13.0 -1.1 -0.9
135i E82 08-13 4X904R 3.6 9.0 -1.0 -1.0

FORD Code Year Part # Spring Rate Drop
Front Rear Front Rear
Kg/mm Kg/mm Inch Inch
FOCUS ST 14+ 4X907R 4.5 5.0 -1.0 -1.0
FOCUS RS 17+ 4X912R 5.0 5.5 -1.0 -1.0
FIESTA ST 14+ 4X910R 3.8 3.8 -1.1 -1.0

HONDA Code Year Part # Spring Rate Drop
Front Rear Front Rear
Kg/mm Kg/mm Inch Inch
S2000 AP1/2 00-09 4H007R 7.5 7.0 -1.2 -1.2
CIVIC SI
(2, 4door)		 12-15 4H915R 4.7 5.4 -1.2 -1.0
CIVIC TYPE R FK8 17+ 4H917R 6.3 7.4 -1.0 -1.0
CIVIC SPORT, SI FK7 17+ 4H918R 4.1 5.7 -1.1 -1.1
ACCORD SPORT CV3 18+ 4H919R 3.6 4.8 -1.2 -1.2

INFINITI Code Year Part # Spring Rate Drop
Front Rear Front Rear
Kg/mm Kg/mm Inch Inch
Q60 RWD CKV37 16+ 4N913R 10.5 5.0 -1.0 -1.0
Q60 AWD CKNV37 16+ 4N914R 9.5 5.0 -1.8 -1.8

LEXUS Code Year Part # Spring Rate Drop
Front Rear Front Rear
Kg/mm Kg/mm Inch Inch
RC F USC10 15+ 4T914R 9.0 16.0 -1.3 -1.0
RC350 RWD GSC10 15+ 4T915R 5.6 11.0 -1.6 -0.9
GS F URL10 16+ 4T916R 8.0 14.0 -1.3 -1.0

MITSUBISHI Code Year Part # Spring Rate Drop
Front Rear Front Rear
Kg/mm Kg/mm Inch Inch
LANCER EVO 8 / 9
(GSR)		 CT9A 03-07 4M008R 6.4 6.8 -1.4 -0.8
LANCER EVO 8 / 9
(MR)		 CT9A 05-07 4M017R 6.4 6.8 -1.4 -0.8
LANCER EVO X
(GSR, MR)		 CZ4A 08+ 4M020R 5.3 5.3 -1.3 -1.0

MAZDA Code Year Part # Spring Rate Drop
Front Rear Front Rear
Kg/mm Kg/mm Inch Inch
MAZDASPEED 3 BL3 10+ 4Z906R 4.5 4.5 -1.2 -1.1
MAZDASPEED 3 BK3 07-09 4Z906R 4.5 4.5 -1.0 -0.6
MIATA ND 16+ 4Z908R 4.8 2.4 -1.4 -1.3

NISSAN Code Year Part # Spring Rate Drop
Front Rear Front Rear
Kg/mm Kg/mm Inch Inch
350Z Z33 03-08 4N014R 7.5 8.2 -1.2 -1.0
370Z
(Reg, Nismo)		 Z34 09+ 4N905R 10.0 10.5 -1.2 -1.0
GTR R35 11-14 4N017R 20.0 11.0 -1.0 -1.0

SCION Code Year Part # Spring Rate Drop
Front Rear Front Rear
Kg/mm Kg/mm Inch Inch
FRS ZN6 13-16 4T909R 4.4 5.3 -1.1 -1.0

SUBARU Code Year Part # Spring Rate Drop
Front Rear Front Rear
Kg/mm Kg/mm Inch Inch
IMPREZA WRX STI
(SED / WAG)		 GRB 11-14 4F907R 6.0 7.2 -0.6 -0.6
BRZ ZC6 13+ 4T909R 4.4 5.3 -1.1 -1.0
WRX STI VA 15+ 4F914R 6.3 7.4 -1.0 -1.0
WRX VAG 15+ 4F915R 6.0 7.2 -1.0 -1.0

TESLA Code Year Part # Spring Rate Drop
Front Rear Front Rear
Kg/mm Kg/mm Inch Inch
Model 3 RWD 18+ 4X928 3.8 7.3 -1.0 -1.1

TOYOTA Code Year Part # Spring Rate Drop
Front Rear Front Rear
Kg/mm Kg/mm Inch Inch
86 ZN6 17+ 4T909R 4.4 5.3 -1.1 -1.0
SUPRA 20+ 4T919R 4.8 12.0 -1.2 -1.2

Due to continued engineering advances, product specification may change without notice.

Spec-R Springs
Built for track duty, Swift Spec-R springs are designed at the upper limits of the OEM shock valving. Track tested and tuned for optimum performance yet comfortable enough for a daily driver.

Swift made Sport Springs keeps the quality ride you get from the showroom, and adds improved handling and lower ride height for driving enthusiasts and style minded drivers who demand only the best.

From HPDE events to SCCA competition, Swift Spec-R Sport Springs are made for the track enthusiast looking to take their vehicle to the next level.

Swift Spec-R Sport Springs were engineered with 3 characteristics in mind.
Modified ride height compared to Sport Springs to maximize optimal suspension geometry.
Further increasing the spring rate to enhance overall performance. The increase in spring rate is based on the upper limits of the vehicles factory shock valving.
Maintaining optimal comfort level for street use.

Spec R springs are wound with the same engineering and material as our sports springs. With the exception of stiffer rates and slight change in ride height; you can expect the same characteristics as our sports springs.