so let me get this straight...
You buy an intake, have an exhaust (axleback or whatever) and the best option is to get a handheld "plug-n-play" ECU thingamajig with pre-loaded maps for which help you get the best A/F ratio. So, effectively no need for a dyno tune?
I am no expert by a long shot, BUT, I think having a dyno tune is probably the best thing you can do because your car is on the dyno and they can see exactly what works best for your car as they do it and can make any adjustments needed to get the most power, I know a mechanic that recommended a shop I could take my car to, to have it dynoed, he said for like 500$ they would do like 3 dyno pulls, making the necessary adjustments each pull to get the optimal performance out of my engine, where getting something like an SCT/SF3 or a Diablo etc....you're not really going to see in real time (like you will on a dyno) if you are getting the very best optimization for YOUR engine, I have the SCT/SF3 93 tune and my car runs like a beast now, however, I do not know if I had it dynoed if I could have gotten a tad more power or not, again I'm very new to the S197's and I may not be correct here, BUT, this is the impression I get.
I should say this, I know Companies like SCT (Bama) Diablo, etc....dyno test their tunes and will custom build your tune according to the modifications you have done to your car, I would imagine its just not the same as having YOUR rear wheels spinning their dyno, I would think every car is a bit different (even bone stock like mine) and having YOUR car on a dyno would be the best way to ensure the tune you're getting is whats best for YOUR car.
Hopefully I am not giving false information, if I am wrong I apologize in advance.
Best of luck
