I drive a 92 YJ 4.0, everything about the performance aspect is stock as could be. I was told by a guy who owns a 2.5 ltr that if you chuck the air box and replace it with a short ram air intake your mileage and power increases. He also mentioned multi hole injectors too, don't know anything about that. Just a few questions about all this. Is there really much benefit to new air intake, can I do it cheaply cause from what ive seen online, 250$ for a short ram is way out of the question. And what would I need for a DIY project. If it seems simple enough, ill do it and post pics at each step. Thanks.