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There are a number of mods you can do for power. I'd be leery of anyone offering a performance chip for the price quoted in that Ebay post. Best go with one of the reputable brands that will offer you quality and proven results.
Plenty of options out there as far as tunes go, but you'd want to look at the Procede by Vishnu, the JB3 by Burger Motorsports, ESS and Active Autowerke also have tunes for the N55 motor also.
You may also want to consider a downpipe for the N55 motor. The chip and downpipe are the single two most important mods you can do for this car, and for under 1500 dollars you can have close to a gain of 80HP at the wheels.
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