I know the enclosure for the front is 6.5", so the speaker will fit. But what about depth. Does anyone if there are problems?
Also do the tweeters that come with the alpine speakers fit inside where the stock tweater mounts are on an integra?

 

You will have to create a bracket to mount them on and cut out the plastic back. It's a pain in the butt, but if done right the 6.5s sound so much better than the 5.25s. Make sure you measure to see how wide the bracket should be to make sure the speaker doesn't hit the back of the door or rub the grill. My friend used a speaker basket and cut the inside out to use the outside as a bracket. HTH