buying a chip on ebay? You're speaking about something like a performance dinan or JC Ecu right? I've heard good things once or twice, but mostly bad things. Not worth the 20-30 bucks if that could be going towards true chip.
If it sounds too good to be true it generally is. No one sells a chip or a reprogrammer for cars that will produce 20 HP and goes for $20-$30. BMW tuners like DINAN or Jim Conforti (bonnevillemotorwerks) sell tings like thes for a couple of hundred dollars, so be very wary.
If you are serious about chipping yur car, got to motorwerks.com and check them out. You will not like the price but this is a reliable company run by Jim Conforti, a BMW tuner, and all specs for your car are on his site.
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