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I would stay away from chip like that one on the link. This seems just like one of these "chips" you can get on ebay for pennies. Just ask yourself how would you add 50+ HP and 50+ lb/f on a normally aspirated engine using just software upgrade? Judging from the installation diagram this so called chip doesn't look like software upgrade either, more likely it alters the data the air intake temperature sensor is sending to the engine ECU.
The site looks fishy too - all kinds of brands and models with same "chip" at same price with same preformance gains claimed? No?

About warranty - most manufacturers will partially/completely void warranty no matter real chip (modification to the ECU programs) or one like above is found in the car.
 

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It most certainly will void the warranty. I am an automotive engineer. Engineering is a process of balancing and compromising, engine calibration in particular. The stock calibration is a balance of power, torque, longevity, emission, fuel consumption, cost, and many other factors. For manufacturer to make a change, there have to be DV (Design Validation) and PV (Production Validation), each comprises of a long list of comprehensive tests. The rule of unintended consequences dictates that even if this chip could boost power as it claims (and that is a big IF), it may screw up a number of other things.
 
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