Installation time is about 2-3 hours with stock exhaust manifolds (installation time may be longer with aftermarket headers). Proudly made in the U.S.A. The MM301 is also height adjustable. This will give increased under-hood clearance for a strut tower brace or supercharger, and a lower center of gravity for improved handling. Fits all 2008-2009 Pontiac G8s and 2014-2017 Chevrolet SSs (automatic and manual);MIG-welded 1/4-inch plate steel;Black anodized 6061 billet aluminum machined spacers;Grade 10.9 hardware;Elimination of engine deflection;Better throttle response;Quicker reaction times;More accurate shifts (Manually-equipped cars) ;Engine can be easily lowered -inch or -inch for more under-hood clearance;Weighs about 2 pounds less than stock motor mounts;Designed for street performance, drag race, and road race applications;Designed to work well with any power level;Durable powdercoat finish;2-3 hour installation time;Proudly designed in the U.S.A.;Proudly made in the U.S.A.