I believe TKOP and edwin have it right.
The sacrifice is using Premium fuel which in my town is $1.50/gallon (just cost $18 to fill up my small car from empty yesterday). To me, that's not bad, but if $$$ is tight already, it's not gonna help
AFAIK for my car, if you had an auto trans (I have manual), it didn't produce as much perf. gain because - if you noticed in the other thread - you have to access the high rpms to get that power. That's easy with a manual, just downshift when you go to pass

. But auto would shift, etc.etc. (grr)
My chip retails for $250 brand new.....I got it for $150 used. AFAIK, not all chips are created equal....it would be good to check out a bbs for your car and get some info.
My chip - and probably most (dunno) - eliminated the top speed gov'ner which used to be at approx. 112mph and now is 125mph or so. It also increased the redline by a few hundred rpm.
Here is the descrip of mine:
Quote:
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These engine chips adjust the ignition timing and fuel curves which results in increased performance.
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Link to my chip:
http://www.bmwtoys.com/Merchant2/mer...ory_Code=Chips
Here are performance stats for BMWs - note, some have greater/less gains depending on the car:
http://www.bmwtoys.com/Merchant2/gra...ips/mods.shtml
Warthog