K, I need some help guys-

After months of debating, I finally decided to initially go with MAC's offroad Prochamber H pipe with the stock muffler's (and eventually buy something axleback), but after talking to numerous sources..found that the only way to get rid of my check engine light (and my engine running poopy) caused from removing the O2 sensors is to get a tune. Any we all know, the only way to do that is to spend 350+ on a Diablosport/SCT/alike, or take it to a Dynotune and spend more money. I'm a first time mustang buyer, college student, and can't really afford all the additional money on top of the 400+ for the midpipe. The reason I wanted exhaust to be my first mod is so that I wouldn't need to quite spend all the additional money on a reflash or tuner (which I realize I'm going to eventually buy anyway, but I want a mod now, esp exhaust!!) I realize I could just get something axleback for sound, but I want some gains.. Someone helppp....I know people haven't had much experience with the MAC prochamber, but any input would be greatly appreciated. Thanks!

 

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Tuner is the only thin i know for sure, but try MIL eliminators?