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I don't have any experience with them but I was interested in them a few years back. (about the same time as yours were installed) best way to know would be to do some comparative tests with the factory chips. check and see what type of claims the manufacturer makes and whether they stand up. if you have access to a dyno, check their performance versus the stock ones there. if not, you could start by doing a battery of tests for each set of chips (standing starts, timed acceleration runs, time to pass, etc.) and compare the results.
there is an interesting tech article on this site in the 944 section (I'd have to find it) that discusses a neat little program to calculate engine power output using a sensor and a PC sound card to "record" the engine noise and determine horsepower. I haven't used it yet but I'm going to give it a try. it might not be the most exact way to do this but I'm sure it would give you a good idea
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