Inline Pro is an absolutely awesome shop! I had their turbo kit on my built S2000 - made just shy of 600whp (597.7) on a weak tune. The air fuel was far too rich, ignition timing was funky, and the tuner backed off 8psi shy of the target boost I told him to aim for. Cody makes a great kit for the S2000, however there have been many different threads on S2Ki stating problems. I've only heard the best of things with his NSX Kit though!
The design that Inline Pro used for the S2000 did limit the turbo size that could be used, however there have been a few members who have made good reliable power with their kit. With the fact that it's the best priced kit and Inline Pro's excellent customer service - it's untouchable!