What is the best perfomance chip for my car?

Question

I see alot on ebay but dont know what to go with, some ads seem misleading and too good to be true? lol 75 mpg?

http://cgi.ebay.com/ebaymotors/PERFORMANCE-CHIP-OLDSMOBILE-TORONADO-1986-1992-91_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1205Q7c66Q3a2Q7c65Q3a12Q7c39Q3a1Q7c240Q3a1318Q7c301Q3a1Q7c293Q3a1Q7c294Q3a50QQ_trksidZp3286Q2ec0Q2em14QQhashZitem4145aac9cdQQitemZ280341694925QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

http://cgi.ebay.com/ebaymotors/1-PERFORMANCE-CHIP-OLDSMOBILE-TORONADO-1986-1992-91_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1205Q7c66Q3a2Q7c65Q3a12Q7c39Q3a1Q7c240Q3a1318Q7c301Q3a0Q7c293Q3a1Q7c294Q3a50QQ_trksidZp3286Q2ec0Q2em14QQhashZitem335087c175QQitemZ220394406261QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

http://cgi.ebay.com/ebaymotors/1-PERFORMANCE-CHIP-OLDSMOBILE-TORONADO-1986-1992-91_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1205Q7c66Q3a2Q7c65Q3a12Q7c39Q3a1Q7c240Q3a1318Q7c301Q3a0Q7c293Q3a1Q7c294Q3a50QQ_trksidZp3286Q2ec0Q2em14QQhashZitem29fdd9598cQQitemZ180352539020QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

http://cgi.ebay.com/ebaymotors/2N1-PERFORMANCE-CHIP-OLDSMOBILE-TORONADO-1986-1992-91_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1205Q7c66Q3a2Q7c65Q3a12Q7c39Q3a1Q7c240Q3a1318Q7c301Q3a0Q7c293Q3a1Q7c294Q3a50QQ_trksidZp3286Q2ec0Q2em14QQhashZitem4a97784152QQitemZ320368820562QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

Lucy · Accepted Answer

I would recommend using caution when buying such a product on ebay unless you have confirmed that they are an authorized dealer. Otherwise, you may get stuck without technical assistance or a warranty if you should have any issues with it. MPG gains are no guarantee because there are too many variable factors, such as driving habits and vehicle maintenance. You would probably have to do some additional modifications such as upgraded air intake and exhaust to see any significant gains in fuel economy.

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What is the best perfomance chip for my car?

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