This is a great upgrade for those with the 4.0 91-98 intake manifold to get the 99+ curved runners and larger intake plenum. There's a right up on this site
http://go.jeep-xj.info/HowtoIntakeManifold1.htm as well as links to dyno proven results. Im going to sandblast it this week to clean it up a little bit. I dont have any pics of mine yet but from that website they are...
You can get even better results by doing this while upgrading headers. Looking for $100+shipping. Thanks for looking.
