Hypertech makes one. It is part#424001. I got mine from Summit Racing for about $100. Honestly it doesn't control much but it does show better performance with higher octane gas. I can only get 91 octane here in smog country, but with an octane booster it does show more improvement.
I think the $100 would have been better spent on a 4 bbl carb and intake from a 4.1. I would have went that route but still have to go through smog check and mods like that are illegal. Not that it is a bad chip, better than stock but it's no "wonder" chip that will help that weak motor.
Hope I've been able to help.
