Description Reviews The Powerflex Lower Engine Bushings are designed to stiffen and reduce movement of the engine. This results in a more direct feel when accelerating and shifting. Bushings are sold as a set, and you can get the rear large bushing, the small front bushing, or BOTH bushings. For the stiffest mount replacing both of the bushings at the same time. But for a quick and easy install that makes the most difference, start by replacing just the large bushing. If you then feel you want more, get the small bushing. Powerflex polyurethane bushings are designed to decrease the amount of deflection in your car's suspension for better handling, more driver feedback, and better tire wear. Powerflex uses premium polyurethane materials for minimal NVH (noise, vibration, harshness) and increased longevity over the stock rubber bushings. Bushings come in pre-determined durometers (measured hardness) from Powerflex to work best in each particular location. The street bushing will work best for mostly everyone. They have been spec'd by Powerflex to be the best durometers for your application and are 70A (Yellow), 80A (Purple), and 95A (Black). Powerflex grease is supplied with every dynamic product. We suggest using only this grease for lubrication. Due to grooves and knurls cast into the material to hold the lubricant, bushings will rarely need re-lubing. We do not suggest using an "anti-seize" product for lubrication. Want a stiffer bushing? Have a track car? Try "The Black Series," a new range of bushings developed for Race, Rally and Circuit use. The Powerflex Black Series bushings are manufactured using a 95 Shore A compound to provide maximum control of chassis geometry. Warranty: All Powerflex bushings are made in the UK and come with a unlimited mile warranty.