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Originally posted by Addict
Limited Slip Differential. Helps with traction.
http://auto.howstuffworks.com/differential.htm

Most Civics and other honda's have an open slip differential, which is why when you peel out only one wheel spins.

With a limited slip differential, the front wheels lock together and will spin at the same time. It helps a lot when powering out of corners and launching off the line.

As for your integra, a First Gen (SiR-I) B16A w/cable tranny should fit right in.