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Cobb makes a nice product. I used it on my 535 wagon. The car has a twin turbo engine that responds well to ECU flash (not piggy back). Nice thing is you can flash it back to factory with a push of a button. However, depending what you do, you may need to re-gap plugs and hunt down misfires from plugs and/or coil packs. The $/hp of a flash compared to getting the same HP increase in a P-car is amazing (crazy cheap). Just make sure the current set up is up to snuff and well sorted before adding a flash tune.
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