The only place performance chips really make a difference is with turbocharged engines, where a chip can turn up the boost and do whatever else is necessary to handle the higher horsepressure (assuming you use the right gas, etc.). Put a chip on a naturally aspirated engine and all you're doing is remapping things so that you get a little more power here at the expense of less there. If you want to do something specific like achieve maximum torque at a different point than stock, a chip is fine, but if you expect a chip to raise horsepower at all rpms, you'll be disappointed.
Stephan
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