Another upgrade you should not underrate is having the tweeter in the door with the mid. I'm not necessarily talking about it being a two-way speaker, but having the mid and the tweet together in the door as opposed to having a mid in the door and the tweet in the dash makes a bigger difference than you might think. The tweets in the dash to me, is insulting and you really need not look further to know that the stock stereos in 80's are a mere afterthought.