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there are plenty of charts out there. in fact, i did a chip shootout test a number of years ago, and tested quite a few chips. at this point i think i've done about 200 runs testing various chips. i published charts on most of them. results ranged from 7 to 15hp.
actually, i have quite a bit of experience with standalones, and i am not denying the advantages. clearly they are more capable of change. for the one-off guy, who likes to continually tweak things, they make sense. for the average guy, who just wants to add more power, quickly and easily, they don't. after dealing with the 968 market for 11 years now, i can tell you for certain that it is a very small market, and most of the guys want inexpensive simple things.
passing the tailpipe test is irrelevant. you cannot LEGALLY remove or modify the MAF, whether some buddy got away with it or not. also, in the case of the 968, unless you have written code to circumvent triggering the check engine light, which is a first step in a smog test, it will not pass. this is something i had to deal with when i developed the CARB certified supercharger kit. they carefully inspected everything on the car. during the certification process, they even drained the tank and used their own fuel, to ensure there was no cheating. the laws are VERY strict, and they are being adopted state by state, all across the union, as the population increases, air quality decreases, and they fail the EPA testing, which then mandates they incorporate the same testing as california.
the 968 is a very different animal than the 944. what might work on the 944 very often does not on the 968, even though they share a lot of things. for example, there are well over 100 maps in the 968 ECU. i had to tune over 20 of them to make the car run right. it's even tuned differently for different countries.
all that aside, for a few hundred bucks now, you can buy the interface and burner, and get the tuning software, and do this yourself, without having to change anything. the map module is out there too. it's really a matter of time, more than cost. even with a standalone, you'll still need to get an A/F meter and a knock counter, in order to tune things. suddenly you're up to $2k. the market for that cost is small. i contemplated offering a normally aspirated tuning package that would add 30hp and 15 lb/ft for about $2k. i had a total of 10 bites. if you delivered it complete with a tune, you'd stand a much better chance.
all that being said, a standalone would likely have made my process a lot easier, if i could have found a way to use it legally. certainly tuning the chips was no picnic. unfortunately, here in california, and now many other states, they are not legal on gasoline powered cars.
still, they might be ok for an E85 application. somebody else is going to have to look into that one.
again, best of luck
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