Isotropic Super Finishing (ISF)

Click Here For Ratio Chart

Click Here for Service Parts List

RST-1140 Type RA Gear Set for 5MT '99-'07 Base Kit $1425
(Ratios -- 3.083 / 2.062 / 1.545 / 1.151 / 0.825)
RA-IK02 RA Install Kit MY02 WRX (TY754VN2AA) $175
RA-IK03 RA Install Kit MY03 WRX (TY754VN2BA) $135
RA-IK04 RA Install Kit MY04 WRX (TY754VV4AA) $35
RA-IK05 RA Install Kit MY05-08 WRX $63
RA-IKNT1 RA Install Kit MY99-04 Non-Turbo $250
RA-IKNT2 RA Install Kit MY05 Non-Turbo $105
RA-IKNT3 RA Install Kit MY06-08 Non-Turbo $133

RST-1141R Type STi Gear Set for 5MT '99-'07 Base Kit $1220
(Ratios -- 3.166 / 1.882 / 1.296 / 0.972 / 0.738)
ST-IK02 STI Install Kit MY02 WRX (TY754VN2AA) $380
ST-IK03 STI install Kit MY03 WRX (TY754VN2BA) $340
ST-IK04 STI Install Kit MY04 WRX (TY754VV4AA) $120
ST-IK05 STI Install Kit MY05-07 WRX $35
ST-IKNT1 STI Install Kit MY99-04 Non-Turbo $455
ST-IKNT2 STI Install Kit MY05 Non-Turbo $190
ST-IKNT3 STI Install Kit MY06-08 Non-Turbo $212

Installation parts are now sold separately from the gear set. Please select the required install kit when ordering either type RA or type STI gear sets. Base kit includes main shaft, 1st to 5th gears, and speedometer gear. '99-'01 turbo models (non-USA models) should order MY02 WRX install kit.

This is the least expensive way to substantially increase the reliability of the WRX gearbox. Only Rallispec RA & STi gearsets feature the REM isotropic superfinishing process (micro-polish) now treated entirely in-house. ISF provides substantial benefits in terms of reducing gear tooth friction and eliminating surface imperfections (stress risers). REM ISF is used extensively at the highest levels of motorsport (F1, WRC, Nascar). Our real world testing has shown huge improvements in reliability far beyond any other surface treatment we have tested.
Type RA sets are close ratio sets for maximum acceleration and performance.
Type STi sets are similar to stock (slightly closer ratio in 1st, 2nd, and 3rd) for better highway performance and top speed capabilities. RA has a slight edge in torque capacity over the STi sets.

Install kits come with the parts necessary to properly install the gear set into your particular vehicle. At minimum the kit will include a full set of shaft lock nuts, case gasket, and oil seal. Some kits will include additional parts such as updated synchro hubs, thrust washer, shift rail, etc.

PPG-4S5H Synchro 1st-4th Helical Cut Gear Set $4301
(Ratios -- 3.18 / 1.87 / 1.32 / 0.95 / OEM)
PPG-4S5S Synchro 1st-4th Straight Cut Gear Set $4301
(Ratios -- 3.08 / 1.87 / 1.32 / 0.95 / OEM)

PPG synchro gear sets feature specially engineered tooth profiles capable of transmitting massive torque outputs. Straight cut tooth proiles are recommended for racing applications with extreme shockloading while helical cut profile is recommended for street applications requiring quiet operation. It is possible to combine 1st/2nd straight cut with helical 3rd/4th at no additional cost. Strongly recommended for applications exceeding the limitations of the RA or STi gears. No additional parts are included. Installation requirements vary by vehicle. We recommend having us handle the installation work (contact us for pricing).

PPG-5D5T GC8 Group N 5 Gear Subaru 5MT Dog Kit $8956
(Ratios -- 2.916 / 2.090 / 1.555 / 1.176 / 0.900)
PPG-4D5S Dogbox 1st-4th Straight Cut Gear Set $5414
(Ratios -- 3.18 / 1.87 / 1.32 / 0.95 / OEM)
PPG-4D5H Dogbox 1st-4th Helical Cut Gear Set $5617
(Ratios -- 3.08 / 2.15 / 1.50 / 1.05 / OEM)
PPG-INTER Shift Interlocker (for 4 gear sets) $607

PPG dog gear sets are designed for fast and reliable shifts within the racing environment. Group N set (shown in top picture) comes as semi-assembled shafts along with special reinforced 2-piece main shaft, reverse idler gear, all 3 selector forks in billet steel, and shift interlocker (to prevent selecting 2 gears at once). The Group N dog set is the strongest 5-speed gear kit we offer.

4-gear dog sets come with one piece main shaft, 1st/2nd and 3rd/4th dog rings, reverse idler gear, and 1st/2nd and 3rd/4th billet selector forks. Shift interlocker should be purchased separately.

PPG-6D6T GroupN 6 Gear Subaru 6MT Dog Kit $11132
(Ratios -- 3.636 / 2.375 / 1.761 / 1.346 / 1.062 / 0.842)
PPG-5D6T Group N 5 Gear Subaru 6MT Dog Gear Kit $10120
(Ratios -- 3.333 / 2.284 / 1.750 / 1.333 / 1.040)
PPG-4D6T Drag 4 Gear Subaru 5MT Dog Gear Kit $6882
(Ratios -- 3.08 / 1.88 / 1.35 / 0.96)

PPG dog gear sets are designed for fast and reliable shifts within the racing environment. Group N sets are available in homologated 5 gear or 6 gear sets. 5 gear set pictured. Includes semi-assembled shafts, reverse gear, two-piece main shaft, all selector forks in billet steel, selectors. Also available is a 4 gear drag set for extreme power applications. All sets feature straight cut teeth.

PPG-5D5E Group N EVO 4-9 Dog Kit $8298
(Ratios -- 3.000 / 2.000 / 1.471 / 1.111 / 0.857)
PPG-FD5E Group N Final Drive Set (4.307) $2024

PPG dog gear set for Mitsubishi EVO 4 through 9 models with 5-spd gearbox. Straight cut tooth profile for maximum reliability. Complete with semi-assembled gear shafts, reverse idler gear, billet selector forks and optional final drive gears.

RST-1145kit JDM 6MT Close Ratio 5/6 Conversion $339
(Ratios -- 1.062 / 0.842)
RST-F145kit High Speed 2nd-6th Ratio Conversion $1050
(Ratios -- STD / 2.235 / 1.521 / 1.137 / 0.891 / 0.707)

RST-FK6T Billet Selector Fork Kit (3 pcs.) 6MT $895

RST-1909 Group N 4.44 Front Final Drive 6MT $1495

6MT upgrade options for various applications. JDM close ratio conversion includes 5th & 6th gear set (add $60 for set of 3 carbon baulk rings for 4th, 5th, and 6th gears). Use to improve on problematic 4th,5th,6th synchro performance. Or use to convert USDM/Euro gearbox to proper Group N ratios.

High speed ratio conversion ideal for high speed track or drag use. Improves gear spacing over existing USDM ratios. Includes main shaft and 2nd-6th gears. Includes updated 2nd and 3rd synchros (required for pre-'06 models) and special keyways.

Billet selector fork kit includes 1st/2nd, 3rd/4th, and 5th/6th forks machined from steel billet for maximum reliability. Eliminates worn out plastic fork tabs (a serious problem on the 6MT) which can lead to loss of shift precision.

RST-3500 Quick Shift Linkage 5MT $260
RSTL-350 Quick Shift Linkage 5MT Leg. + MY08 Imp. $260
RST-3501 Quick Shift Linkage 6MT $390
RST-3501B Quick Shift Linkage MY08 STI $390

Re-engineered shift linkage assembly reduces shift throw for fast shifting. 6-speed shift linkage pictured.

RST-3501C Competition Gear Shift Linkage 6MT $585
RST-3501D Competition Gear Shift Linkage MY08 STI $585

Competition specification gear shift linkage eliminates all compliant bushings and joints for optimum shift feel. Shifter stay bush is machined plastic, shifter joints utilize all metal bearings, etc. Optimized shift ratio. MY05 to 07 Homologation for group N. But will fit all 6MT. Does not include rear cushion (can use RST-3529).

RST-3529 Heavy Duty Shifter Rear Cushion $19.50

Uprated shifter cushion is the rear mounting of the gear shift linkage. Improves shift feel. For both 5MT and 6MT.

ORDER REQUESTS:
 sales@rallispec.com

TECHNICAL QUESTIONS:
tech@rallispec.com

GENERAL INQUIRIES:
rallispec@rallispec.com