This is all nuts. I have to believe that Honda's engineering department knows what the heck they were doing to get the best overall performance out of the car.
The funny thing is, these same types of arguments are made in the Porsche world about my 996. Please. Some guy in a garage in Boise knows more about these things than the engineers in Zuffenhausen?
I'm sure the same arguments are made in the BMW circles, the Corvette circles, etc.
As with most mods, you may get more HP/Torque in one area, but you're robbing it from somewhere else. Net result: no improved performance.
The thing I find funny, is that people are saying COLD INTAKE is best, and now COLD EXHAUST is best. SO... I'll just leave my engine turned off all the time and feel good about myself that my stone cold NSX in my garage is faster than a warm one being driven on the highway.
Go do some dyno runs with these homebrew "racing mods". But if you do, PLEASE do them on the same car, same dyno, same day, same environmental conditions, etc., ad nauseum.
Flame away.
EDR
91 NSX Black/Ivory