Hooked up a vacuum gauge to my SE-V6 last night...

[silverton]

And found out that there is no way to improve air flow!  At wide open throttle just before the upshift in to third, there is less than 1 inHg. 

Granted, my car has a vented, stock, airbox and no catalytic converter and a Borla XR-1 muffler, but as it sits, my car would not benefit from a cone filter, or replacing the stock intake piping, or manifold.

[Jay]

I promise you that number is higher at the end of the runners at the head ports.

[silverton]

I promise you that number is higher at the end of the runners at the head ports.

Of course it is, and you can't measure it there anyways as it's almost impossible because it is pulsing.

[s12rich]

i have the same muffler and a cone filter ....and i would say there was an improvment at 100 plus for suree