Porsche

Extended Bolts Hex 19 M14x1.5x45mm with a floating moving washer 

Fits with an 15mm wheel spacer setup for Porsches (Please research thoroughly for other manufacturers fitment setup)

608 - Harmonically Damped - Underdrive Performance Pulley Kit (986, 987, 996, 997)

The RSS Harmonically Damped Underdrive Pulley is ideal for engines that are running light weight flywheels, engines that are built - bored/stroked and engines that are driven hard.

• Offers improved HP & TQ by reducing drag from the power steering pump, A/C, water pump and alternator without detrimental effects on said ancillary systems.

• Dampens/reduces internal engine harmonics for improved engine performance, efficiency and longevity. 

• Recommended for street or track use

Fits on all Porsche 986, 996, 987, 997 models. Does Not Fit 2.9L (multi hole crank pulley pattern), DFI engines, GT2, GT3 and Turbo.

Installation tool (wrench) and new OEM Pulley Washer included:

Dyno Image shows HP & TQ gain on 2005 997.1 Carrera S:
Baseline Dyno Run Mods: OEM Crank Pulley, OEM Software, Cargraphic Headers, Hi flow 200 Cell Cats, and Medium Sound Cargraphic Sport Mufflers
Modified Dyno Run: Added RSS Pulley (Part #608) to baseline car with existing mods:
+16 HP / +8 ft lbs TQ

*NOTE: We recommend using/sourcing a new OEM Crank Shaft Pulley Bolt for your specific vehicle when installing the RSS Pulley. (Not Included with 608 Kit)

We recommend using the appropriate length belt RSS # 6PK which can also be purchased on our website.

MADE IN USA

Extended Bolts Hex 19 M14x1.5x37mm with a floating moving washer 

Fits with an 7mm wheel spacer setup for Porsches (Please research thoroughly for other manufacturers fitment setup)

7MM PORCHE SPACERS SET INCLUDE 2 ROTOR RETAINING BOLTS WITH EACH PAIR. SOFT ANODISE IN SATIN SILVER.  (BOLTS AVAILABLE FOR AS A SEPARATE PURCHASE)

Silver 7mm aluminum allow with 71.6 center and 5x130 pattern with relief cut edge for easy removal

2 SPACERS

2 ROTOR RETAINING SCREWS

15MM PORCHE SPACERS SET INCLUDE 2 SPACERS, 2 ROTOR RETAINING BOLTS WITH EACH PAIR. SOFT ANODISE IN SATIN SILVER.  (BOLTS AVAILABLE AS A SEPARATE PURCHASE)

Silver 15mm aluminum allow with 71.6 center and 5x130 pattern with relief cut edge for easy removal

2 SPACERS

2 ROTOR RETAINING BOLTS