Okay so Mine went into my 2000 GMC Sierra extra cab , Truck is deadened throughout, 250 amp alt and a yellow top, Cdt hd components, Cdt Audio 4100 amp mids and highs, and a SAZ-2000D running the 4 SA-8's in 3 cubes with two 4" aeroports right around 38hz box built by me. They PoUnD ! and much more sq than i was expecting out of them. ill post a vid soon , but id like to get them on a meter to see what it does.