Pulleys - Crank, Underdrive

Perrin 19-21 Subaru WRX / 16-18 Forester Lightweight Crank Pulley (FA/FB Engines w/Large Hub) - Red

Perrin 02-11 Subaru Impreza / 02-12 WRX / 04-12 STi Pitch Stop Mount - Neon Yellow

Perrin 15-18 Subaru WRX / 13-20 BRZ / 14-18 Forester XT FA/FBCrank Pulley - Blue

Perrin 98-08 Subaru Forester Pitch Stop Mount - Black

Perrin 02-19 Subaru WRX / 04-19 Subaru STI / 13-19 Subaru BRZ Motor Mount Kit

Perrin 93-21 Subaru Impreza / 04-21 STI / 02-21 WRX Pitch Stop Mount - Blue

Perrin 17-19 Honda Civic Si Pitch Stop Mount Insert

Kartboy Battery Tiedown

Kartboy Front Endlink Spacer

Kartboy Subaru Engine Pitch Mount

It might be hard to imagine how reducing the mass of a pulley makes a car go faster, but accelerating a heavy factory pulley from say 3000-7000 RPM in a second or two saps a measurable amount of torque. GFB Lightweight Pulleys reduce inertia by up to 85...

It might be hard to imagine how reducing the mass of a pulley makes a car go faster, but accelerating a heavy factory pulley from say 3000-7000 RPM in a second or two saps a measurable amount of torque. GFB Lightweight Pulleys reduce inertia by up to 85...

It might be hard to imagine how reducing the mass of a pulley makes a car go faster, but accelerating a heavy factory pulley from say 3000-7000 RPM in a second or two saps a measurable amount of torque. GFB Lightweight Pulleys reduce inertia by up to 85...

It might be hard to imagine how reducing the mass of a pulley makes a car go faster, but accelerating a heavy factory pulley from say 3000-7000 RPM in a second or two saps a measurable amount of torque. GFB Lightweight Pulleys reduce inertia by up to 85...

Do you have a Mustang that you use only for racing? Then why don't you get rid of the air pump? They're not needed on racing vehicles, and you will reduce the front-end weight, too. These Ford Racing smog pump eliminator bracket idlers are direct bolt-on...