I have the Unorthodox on my current setup. I have notice a small difference when revving the engine.
Ebay description from Allmotorsports11
OBX Racing Sports™ offers an extensive range of high quality aftermarket automotive products for imports and domestic vehicles. OBX Racing Sports™ sets and maintains the industry's high standards by using the highest grade materials and latest machinery along with advanced cutting edge manufacturing technologies.
Product:
OBX Racing Sports Red Underdrive Crank Pulley
Application:
1993-1995 Mazda MX-6 2.5L
1993-1995 Ford Probe GT 2.5L
Specifications:
Red Color
General Information:
Billet lightweight aluminum alloy engine to rev faster and gain up to 15 HP
T6061 T-6 aircraft grade for structural integrity to withstand all level RPM
Computerized CNC machined cut for precision balance
Gain up to 15 HP
Hard bake anodized color for long lasting
Included all accessories shown on the photo
NO installation instruction with this kit, we recommended professional installation
Flat rate shipping fee only apply to those package shipping within the lower 48 United States
Contact us thru ebay message for any question