My cousin was a big audiophile, and had a sick system in his Suburban. He got rid of the truck and gave me all the speakers, amps, etc etc. I have a small 2002 Nissan Frontier king cab, and put 2 of the speakers into the stock positions on the doors and 2 tweeters into the stock positions. Iam wondering if I need to put silicon around the speakers in the doors? I've heard it helps with sound quality, but I am not sure.