So I have been looking over available tunes for my 3.6 luxury pkg ATS. I like the acceleration I have now and today noticed the car is E85 flex fuel. I see the tunes state additional performance with E85 and I am considering buying one. I would like to know from actual experience what the difference is for adding a tune (with E85 or 93 octane) for a 3.6 rwd vs stock. Thanks and appreciate the input. I have reviewed the tune manufacturer websites but am looking for first hand experience. Thanks. My other option I'm considering is lowering with springs...so the other question is which would you prefer, engine tune or drop in ride height?
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