I had the AEM FI/C on my Eclipse, pulled another 26whp from it, not sure if it works with the Z so give them a call. As far as exhaust goes, I have the stillen, I like the looks because it still looks somewhat stock and sounds amazing with the Berk HFC's, seems like its mellowed out a bit after it burned in, but still sounds great under load. I've seen the exhaust itself produce gains of 15whp plus, which would be comparative to FI's, I just got this one because I'm attempting to keep the Z a sleeper.
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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs
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