"UNORTHODOX RACING-ULTRA S UNDERDRIVE STREET CRANK PULLEY - POLISHED, Lightweight Billet Aluminum, Average 5 To 12 HP Gain On Normally Aspirated Engines And 8 To 16 HP On Forced Induction Engines (Higher Gains Are Possible)"
"UNORTHODOX RACING-ULTRA S UNDERDRIVE STREET CRANK PULLEY - POLISHED, Lightweight Billet Aluminum, Average 5 To 12 HP Gain On Normally Aspirated Engines And 8 To 16 HP On Forced Induction Engines (Higher Gains Are Possible)"
"UNORTHODOX RACING-ULTRA SS UNDERDRIVE PULLEY SET - Lightweight Billet Aluminum, Average 8 To 15 HP Gain On Normally Aspirated Engines And 10 To 18 HP Gain On Forced Induction Engines (Higher Gains Are Possible), POLISHED"